| 单词 | induction coil |
| 例句 | It was thought to hold promise for medicine, too: Edison marketed his inductorium, an induction coil, as a guaranteed cure for rheumatism, gout, nervous diseases, and sciatica. Newjack: Guarding Sing Sing 2000-01-01T00:00:00Z And a magnetic induction coil controls a metal plate that conducts heat away from the electrode to rapidly cool it down and shut off the scent. Virtual Reality System Lets You Stop and Smell the Roses 2023-05-09T04:00:00Z An induction coil safely boils water, a centralized milk vessel keeps cream cold, and an auto-dimming digital display sets both brewing and alarm schedules. Home gifts 2022: Top finds for comfort, style and entertaining | Produced by Seattle Times Marketing 2022-11-01T04:00:00Z A: For readers who missed it, Kibben wrote in asking about cellphones that are compatible with induction coils, the technology employed in wireless charging. Suggestions for non-tech giant email providers and notes storage | Q&A with Patrick Marshall 2021-11-13T05:00:00Z AT&T offered to pay Heaviside for his early contribution, but he insisted that he be given full credit for using induction coils on transmission lines. Engineering: Reclusive genius who connected the world : Nature : Nature Research 2017-09-12T04:00:00Z That includes everything from an "arc gun" powered by induction coils to an early rendition of a grenade to an insane-looking crossbow. Save Victorian London from a werewolf infestation in The Order: 1886 2015-01-16T05:00:00Z It works with a transmitter induction coil creating an electromagnetic field and transferring that power to another coil when they come into contact. Wireless Charging Is Coming To Wearables, Eventually 2014-10-02T04:00:00Z Some of those chips relied on induction coils to draw wireless power from an external source. Biodegradable Battery Could Melt Inside the Body 2014-03-25T19:35:00Z When the coil is set to work, the potential of the sphere is alternated, and a small helix now behaves as though its free end were connected to the other terminal of the induction coil. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z By repeated 502 fractionations he was able to divide yttrium into distinct portions which gave different spectra when exposed in a high vacuum to the spark from an induction coil. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7 "Crocoite" to "Cuba" 2012-01-22T03:00:24.397Z But another and an earlier application of Faraday's discoveries is found in the induction coil. Heroes of Science: Physicists 2012-01-17T03:00:17Z System of inducing Electromotive Force in an Aerial, A. B, battery; K, key; I, induction coil; S, spark gap; C, Leyden jar; E, earth plate; ps, oscillation transformer. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z The induction coil has always been a popular piece of apparatus with those interested in electrical science; the experiments which can be performed with its aid are very numerous. Hawkins Electrical Guide, Number One Questions, Answers, & Illustrations, A Progressive Course of Study for Engineers, Electricians, Students and Those Desiring to acquire a Working Knowledge of Electricity and its Applications 2011-12-24T03:07:54.823Z When the terminals of a high tension induction coil, Fig. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z Short circuits in the condenser or internal wiring of induction coils or magnetos, which are fortunately not common, can seldom be remedied except at the factory where these devices were made. Aviation Engines Design?Construction?Operation and Repair 2011-12-04T03:00:04.777Z Each ball is connected to one terminal of an induction coil. Marvels of Scientific Invention An Interesting Account in Non-technical Language of the Invention of Guns, Torpedoes, Submarine Mines, Up-to-date Smelting, Freezing, Colour Photography, and many other recent Discoveries of Science 2011-11-19T03:00:24.517Z The method due to Professor Braun is as follows: A condenser or Leyden jar has one terminal, say, its inside, connected to one spark ball of an induction coil. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z The latter has caused manufacturers to give much attention to the development of the induction coil, resulting in many refinements of design and construction. Hawkins Electrical Guide, Number One Questions, Answers, & Illustrations, A Progressive Course of Study for Engineers, Electricians, Students and Those Desiring to acquire a Working Knowledge of Electricity and its Applications 2011-12-24T03:07:54.823Z In operating an induction coil with rapidly alternating currents, we realize with astonishment, for the first time, the great importance of the relation of capacity, self-induction and frequency as regards the general results. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z If an airplane engine is provided with magneto ignition solely, as most engines are at the present time, no attention need be paid to such items as storage or dry batteries, timer or induction coil. Aviation Engines Design?Construction?Operation and Repair 2011-12-04T03:00:04.777Z Now the current comes from an induction coil in a series of spurts. Marvels of Scientific Invention An Interesting Account in Non-technical Language of the Invention of Guns, Torpedoes, Submarine Mines, Up-to-date Smelting, Freezing, Colour Photography, and many other recent Discoveries of Science 2011-11-19T03:00:24.517Z Apparatus for showing Stationary Waves in long Solenoid A. I, induction coil; S, spark gap; L, inductance coil; C1C2, Leyden jars; E, earth wire. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z Secondary induction coils may be divided into three general classes: 1. Hawkins Electrical Guide, Number One Questions, Answers, & Illustrations, A Progressive Course of Study for Engineers, Electricians, Students and Those Desiring to acquire a Working Knowledge of Electricity and its Applications 2011-12-24T03:07:54.823Z A few hints as to how this may be accomplished will probably be found useful in most of these experiments with the ordinary induction coil. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z I have here a glass tube containing hydrogen, so arranged that by connecting two wires fastened to it with the induction coil of our electric battery it will soon glow with a bright red colour. Through Magic Glasses and Other Lectures A Sequel to The Fairyland of Science 2011-10-03T02:00:33.003Z Professor Hughes, whose name is associated with certain well-known instruments for ordinary telegraphy, nine years before Hertz' discovery noticed that a microphone was affected by the action of an induction coil some distance away. Marvels of Scientific Invention An Interesting Account in Non-technical Language of the Invention of Guns, Torpedoes, Submarine Mines, Up-to-date Smelting, Freezing, Colour Photography, and many other recent Discoveries of Science 2011-11-19T03:00:24.517Z It will not be necessary to enter into an explanation of the action of the induction coil. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z Hence, a condenser is constructed of conductive material so arranged as to present the greatest surface for a given amount of material.148 The usual form of condenser for induction coils as shown in figs. Hawkins Electrical Guide, Number One Questions, Answers, & Illustrations, A Progressive Course of Study for Engineers, Electricians, Students and Those Desiring to acquire a Working Knowledge of Electricity and its Applications 2011-12-24T03:07:54.823Z A long arc is established between the terminals A B of the first induction coil. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z With the aid of a battery and an induction coil, man causes an energetic electrical discharge to pass through a vacuum tube. Autobiography of an Electron Wherein the Scientific Ideas of the Present Time Are Explained in an Interesting and Novel Fashion 2011-06-19T02:00:25.633Z Alternating current is used, and it is obtained from a transformer or induction coil. Marvels of Scientific Invention An Interesting Account in Non-technical Language of the Invention of Guns, Torpedoes, Submarine Mines, Up-to-date Smelting, Freezing, Colour Photography, and many other recent Discoveries of Science 2011-11-19T03:00:24.517Z If, however, we employ a wire larger in size than No. 34, or at the most No. 32, the bulk and the cost of the induction coil began to rise very rapidly. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z This method has also been used for induction coils, where it is desirable to keep the ends of the wire away from the core and primary coil. Hawkins Electrical Guide, Number One Questions, Answers, & Illustrations, A Progressive Course of Study for Engineers, Electricians, Students and Those Desiring to acquire a Working Knowledge of Electricity and its Applications 2011-12-24T03:07:54.823Z I will illustrate this action of electrostatic force in a novel experiment in which I will employ the induction coil before referred to. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z The energy which we can get from a battery and induction coil is not sufficient for any very long distances. Autobiography of an Electron Wherein the Scientific Ideas of the Present Time Are Explained in an Interesting and Novel Fashion 2011-06-19T02:00:25.633Z Indeed the coil in the local circuit and the one in the antenna circuit actually constitute an induction coil. Marvels of Scientific Invention An Interesting Account in Non-technical Language of the Invention of Guns, Torpedoes, Submarine Mines, Up-to-date Smelting, Freezing, Colour Photography, and many other recent Discoveries of Science 2011-11-19T03:00:24.517Z Generally speaking, however, it may be said that the larger the capacity which is to be charged, the lower should be the resistance of the secondary circuit of the induction coil. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z Secondary, when the voltage and amperage of a primary current have been changed by an induction coil;5. Hawkins Electrical Guide, Number One Questions, Answers, & Illustrations, A Progressive Course of Study for Engineers, Electricians, Students and Those Desiring to acquire a Working Knowledge of Electricity and its Applications 2011-12-24T03:07:54.823Z This induction coil is capable of yielding currents of enormous potential differences, alternating with extreme rapidity. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z An electric generator supplies the source of electricity for operating an induction coil to transform the low pressure into an alternating current of high pressure. The Universe a Vast Electric Organism 2011-06-09T02:00:22.450Z Some attempts have been made to displace the induction coil in wireless telegraphy altogether by a specially made dynamo. Marvels of Scientific Invention An Interesting Account in Non-technical Language of the Invention of Guns, Torpedoes, Submarine Mines, Up-to-date Smelting, Freezing, Colour Photography, and many other recent Discoveries of Science 2011-11-19T03:00:24.517Z Three important adjuncts of the induction coil are the primary condenser, the interrupter and the primary key. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z On account of this spark a primary induction coil is used in low tension or “make and break” ignition systems. Hawkins Electrical Guide, Number One Questions, Answers, & Illustrations, A Progressive Course of Study for Engineers, Electricians, Students and Those Desiring to acquire a Working Knowledge of Electricity and its Applications 2011-12-24T03:07:54.823Z First, I disconnect one of the terminals of the lamp from the secondary S. When the induction coil plays, a glow is noted which fills the whole bulb. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z Low-frequency intermittent currents from induction coils are frequently used where nerve stimulation or muscular contractions are required. The New Gresham Encyclopedia Volume 4, Part 2: Ebert to Estremadura 2011-04-14T02:00:56.200Z Small alternators are used sometimes, however, to supply alternating current to the primary of an induction coil, or transformer, as it is more often called in its larger sizes. Marvels of Scientific Invention An Interesting Account in Non-technical Language of the Invention of Guns, Torpedoes, Submarine Mines, Up-to-date Smelting, Freezing, Colour Photography, and many other recent Discoveries of Science 2011-11-19T03:00:24.517Z The mercury turbine interrupter has been extensively adopted both in the German and British navies in connection with induction coils used for wireless telegraphy. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z Medical coil with armature and attachments consisting of electrodes, foot place, sponge, induction coil etc. Hawkins Electrical Guide, Number One Questions, Answers, & Illustrations, A Progressive Course of Study for Engineers, Electricians, Students and Those Desiring to acquire a Working Knowledge of Electricity and its Applications 2011-12-24T03:07:54.823Z Years ago it was observed that when a powerful induction coil is discharged between the poles of a strong magnet, the discharge produces a loud noise, not unlike a small pistol shot. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z We can cause a train of electric oscillations in one circuit to induce similar oscillations in a neighbouring circuit, and thus construct an oscillation transformer or high frequency induction coil. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z Such an arrangement is in industrial realms generally called a transformer, the term induction coil being employed more for those things of a similar nature intended for the laboratory. Marvels of Scientific Invention An Interesting Account in Non-technical Language of the Invention of Guns, Torpedoes, Submarine Mines, Up-to-date Smelting, Freezing, Colour Photography, and many other recent Discoveries of Science 2011-11-19T03:00:24.517Z The experimental arrangements are as follows: A ten-inch induction coil has one of its terminals connected to the internal coating of a battery of Leyden jars. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z The name Rhumkorff was formerly very widely applied to induction coils for the reason that some of the earliest coils were constructed by Rhumkorff. Hawkins Electrical Guide, Number One Questions, Answers, & Illustrations, A Progressive Course of Study for Engineers, Electricians, Students and Those Desiring to acquire a Working Knowledge of Electricity and its Applications 2011-12-24T03:07:54.823Z When I set the induction coil in operation the lamp filament is brought to high incandescence. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z The outer coatings form two separate rings a, a1; a′, a′1, and the inner coatings are connected with the poles of the induction coil by means of the metal pieces b, b′. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z Only that your frozen meal has smart packaging and the coffee table has induction coils built in. Building the future 2011-01-28T00:05:39Z The continual crackle, of the discharge spark of the induction coil in connection with wireless telegraphy is very annoying to sensitive ears, but in this manner we can render it perfectly silent. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z It closes the transmitter battery circuit at the same time through the primary of the induction coil. Cyclopedia of Telephony and Telegraphy, Vol. 2 A General Reference Work on Telephony, etc. etc. The current traversing the primary is strongest at the end b which is connected to the terminal T1 of the induction coil, and diminishes in strength towards the remote end a. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z When the waves are produced by induction coils or by electrical machines the intervals between the emission of different sets of waves occupy by far the largest part of the time. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z With five Grove cells this induction coil has given a spark forty-two inches long, and has perforated glass three inches thick. The Telephone An Account of the Phenomena of Electricity, Magnetism, and Sound, as Involved in Its Action The induction coil is employed to produce a rapidly intermittent series of electrical oscillations in the primary coil of an oscillation transformer by the discharge through it of a Leyden jar. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z It will be seen that the induction coil serves as an interrupter as well as for transmission. Cyclopedia of Telephony and Telegraphy, Vol. 2 A General Reference Work on Telephony, etc. etc. The effects, however, cannot be compared with those obtainable with an induction coil which is operated by an alternate current machine of high frequency, some of which were described by me a short while ago. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z Large Wimshurst multiple plate influence machines are often used instead of induction coils for exciting R�ntgen ray tubes in medical work. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z Mr. Spottiswood of London has just had completed for him the largest induction coil ever made. The Telephone An Account of the Phenomena of Electricity, Magnetism, and Sound, as Involved in Its Action In this case, a condenser and inductance are connected in series to the spark balls of an induction coil, and oscillations are set up in this circuit. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z The two primary windings 10 and 11 are on separate induction coils, the secondary windings 13 and 14 being, therefore, on separate cores. Cyclopedia of Telephony and Telegraphy, Vol. 2 A General Reference Work on Telephony, etc. etc. Another peculiarity of the rapidly alternating discharge of the induction coil is its radically different behavior with respect to points and rounded surfaces. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z A still greater improvement may be effected by using an electrically maintained fork, which performs the double office of controlling the resolution of the jet and of interrupting the primary current of the induction coil. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 3 "Capefigue" to "Carneades" Could you tell me how to make an induction coil for taking shocks? Harper's Round Table, May 7, 1895 Comparing together, item by item, it will be seen, therefore, that the induction coil or transformer used in connection with electric-wave apparatus is analogous to the air pump in the siren plant. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z The circuit thus established allows current to flow from the test thimble of the jack through the winding of her induction coil to ground, causing a click in her telephone receiver. Cyclopedia of Telephony and Telegraphy, Vol. 2 A General Reference Work on Telephony, etc. etc. In general, most of the experiments usually performed with a static machine can be performed with an induction coil when operated with very rapidly alternating currents. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z The spark may be obtained from the secondary of an induction coil, whose terminals are in connexion with the coatings of a Leyden jar. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 3 "Capefigue" to "Carneades" You cannot make an induction coil save at considerable expense, and even then it is not as good as the one you may buy for less money. Harper's Round Table, May 7, 1895 I, induction coil; CC, condensers; S, spark gap; J, transmitting jigger; K, receiving jigger; F, filings tube; R, relay; B, battery. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z The largest induction coil ever made has lately been constructed for Mr. Wm. The Galaxy, May, 1877 Vol. XXIII.—May, 1877.—No. 5. We observe the small physiological effects, the rapid heating of the iron cores and conductors, curious inductive effects, interesting condenser phenomena, and still more interesting light phenomena with a high tension induction coil. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z The currents from the secondary circuit of a small induction coil are satisfactory, or the currents of an alternating electric light supply may be transformed down to an electromotive force of one or two volts. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 8 "Conduction, Electric" The tuning-fork is placed in the secondary circuit of an induction coil, so that when the primary circuit is broken an induced spark removes a speck of black from the paper and leaves a mark. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 3 "Chitral" to "Cincinnati" We arrange also another closed oscillation circuit, consisting of two Leyden jars and a variable inductance coil and a pair of spark balls which are connected to an induction coil. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z Charlie's induction coil buzzed wickedly, with purple fire playing about the terminals. Astounding Stories, March, 1931 When a large induction coil is employed it is easy to obtain nodes on the bar, which are rendered evident by the different degree of brilliancy of the lamps, as shown roughly in Fig. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z It consists of an induction coil, put into action by a bichromate battery. Criminal Man According to the Classification of Cesare Lombroso When the pendulum swings through its arc, it knocks over the contact key in the primary circuit of an induction coil, the secondary of which is in connexion with the muscle. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 3 "Chitral" to "Cincinnati" I, induction coil; A, aerial; E, earth plate; HH, choking coils; S, spark gap; J, transmitting jigger; K, receiving jigger; R, relay; C, condenser; F, filings tube; B, battery. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z A breaker was placed in circuit with the primary wires of an induction coil, and the fine wires were connected with two strips of brass. Little Masterpieces of Science: Invention and Discovery But the most interesting experiences are gained when the tension of the currents from the machine is raised by means of an induction coil. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z We give a sketch of the induction coil in Fig. How it Works Dealing in simple language with steam, electricity, light, heat, sound, hydraulics, optics, etc., and with their applications to apparatus in common use Each pin is a part of the secondary circuit of an induction coil, the space between the pins and the drum forming spark-gaps. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 3 "Chitral" to "Cincinnati" I, induction coil; M, multiplier; B, battery; A, aerial; F, filings tube; R, relay; E, earth plate; C, condenser. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z Several different forms of induction coils are shown. How Two Boys Made Their Own Electrical Apparatus Containing Complete Directions for Making All Kinds of Simple Apparatus for the Study of Elementary Electricity In operating an induction coil with very rapidly alternating currents, among the first luminous phenomena noticed are naturally those presented by the high-tension discharge. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z A spark of this kind would not be sufficiently hot to ignite a charge in a motor cylinder, and a spark from the induction coil is therefore used. How it Works Dealing in simple language with steam, electricity, light, heat, sound, hydraulics, optics, etc., and with their applications to apparatus in common use The gun-range screens are included in the primary circuits of induction coils; when these circuits are broken a spark from the pointer marks the paper. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 3 "Chitral" to "Cincinnati" I, induction coil; S, spark gap; A, aerial; CC, condensers; E, earth plate; R, relay; L, variable inductance; F, filings tube; B, battery. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z This cell will run small, well-made motors, induction coils, etc. How Two Boys Made Their Own Electrical Apparatus Containing Complete Directions for Making All Kinds of Simple Apparatus for the Study of Elementary Electricity But in an induction coil exceptional conditions prevail. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z The transmitters, it will be noticed, are located in battery circuits, including the primary windings P P2 of induction coils. How it Works Dealing in simple language with steam, electricity, light, heat, sound, hydraulics, optics, etc., and with their applications to apparatus in common use The transmitting apparatus consisted of electric batteries, an induction coil by which the force of the current is increased, a 73 telegrapher’s key to make and break the circuit. Radio Boys Loyalty Bill Brown Listens In B, battery; I, induction coil; K, signalling key; S, spark gap; A, aerial wire; E, earth plate. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z This cell will run small motors, and is good for induction coils, etc. How Two Boys Made Their Own Electrical Apparatus Containing Complete Directions for Making All Kinds of Simple Apparatus for the Study of Elementary Electricity But with an induction coil the discharge of which alternates with great rapidity it is different. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z In the largest induction coils the secondary winding absorbs 200–300 miles of wire, and the spark given may be anything up to four feet in length. How it Works Dealing in simple language with steam, electricity, light, heat, sound, hydraulics, optics, etc., and with their applications to apparatus in common use Batteries were connected with the induction coil and the telegrapher’s key was placed between the battery and the coil. Radio Boys Loyalty Bill Brown Listens In We may imagine this process to consist in forcing additional electrons into it, the induction coil acting as an electron pump. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z An induction coil is a peculiar and wonderful apparatus. How Two Boys Made Their Own Electrical Apparatus Containing Complete Directions for Making All Kinds of Simple Apparatus for the Study of Elementary Electricity In the experiments to this end a high tension induction coil or equivalent apparatus for converting currents of comparatively low into currents of high tension is used. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z It must not be supposed that an induction coil increases the amount of current given off by a battery. How it Works Dealing in simple language with steam, electricity, light, heat, sound, hydraulics, optics, etc., and with their applications to apparatus in common use Photographs similar to those produced by the Roentgen ray tube and induction coil can be got by means of the emanations from a small quantity of radium. The Life Radiant In this arrangement the condenser corresponds to the wind chest, and it is continually kept full of electrical energy by means of the induction coil or transformer, which answers to the bellows of the organ. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z It is well to have ½ lb. of No. 24 or 25 for electro-magnets, current-detectors, etc., etc. ½ lb. of No. 30 will not be too much, if you make induction coils. How Two Boys Made Their Own Electrical Apparatus Containing Complete Directions for Making All Kinds of Simple Apparatus for the Study of Elementary Electricity The recognition of the above fact is of special importance in the construction of the costly commercial induction coils which are often rendered useless in an unaccountable manner. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z What is electricity?—Forms of electricity—Magnetism—The permanent magnet—Lines of force—Electro-magnets—The electric bell—The induction coil—The condenser—Transformation of current—Uses of the induction coil. How it Works Dealing in simple language with steam, electricity, light, heat, sound, hydraulics, optics, etc., and with their applications to apparatus in common use Often I would drop asleep while he was chattering of induction coils, wave lengths, and antenna. Walter and the Wireless B, battery; I, induction coil; K, key; S, spark-gap; L, inductance coil; C, condenser; A, aerial. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z The combination of a battery, induction coil, and electric bell makes a very good outfit for medical purposes. How Two Boys Made Their Own Electrical Apparatus Containing Complete Directions for Making All Kinds of Simple Apparatus for the Study of Elementary Electricity The general arrangement was the following:—An ordinary induction coil, operated from a low frequency alternator, was used to charge Leyden jars. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z It is hoped, however, that by inserting induction coils at intervals along the cables the currents may be "stepped up" from point to point, and so get across. How it Works Dealing in simple language with steam, electricity, light, heat, sound, hydraulics, optics, etc., and with their applications to apparatus in common use Your antenna is connected through an adjustable induction coil, and moreover you have a small condenser which together with it forms a closed circuit. Walter and the Wireless Accordingly, we are limited at the present moment to one of two appliances—viz., the induction coil or the alternating current transformer. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z Much of the ebonite formerly used to cover induction coils for instance, deteriorates so rapidly when exposed to the air that it requires to have its surface renewed every few weeks. On Laboratory Arts That there are only electrostatic effects active seems to be clearly proved by Mr. Tesla's experiments with an induction coil operated with alternating currents of very high frequency. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z The difficulty is to devise induction coils of great power though of small size. How it Works Dealing in simple language with steam, electricity, light, heat, sound, hydraulics, optics, etc., and with their applications to apparatus in common use An induction coil in an alternating circuit for changing potential difference, such as high alternating voltage into low direct current voltage. Electricity for Boys In the practical construction of induction coils for wireless telegraphy, manufacturers have departed from the stock designs. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z Surround him with true believers; and it all seems to act like an induction coil. Sense from Thought Divide The electrostatic induction is now much greater, because the closed secondary determines a greater flow of current through the primary and principally through that half of it which is connected to the induction coil. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z In this long exhausted tube, ten feet in length and three inches in diameter, a brilliant and beautiful crimson stream was produced, by means of an induction coil. The Battery and the Boiler Adventures in Laying of Submarine Electric Cables The induction coil in induction machines, or in a transformer. Electricity for Boys We are all familiar with the appearance of the instrument maker's induction coil; its polished mahogany base, its lacquered brass fittings, and its secondary bobbin constructed of and covered with ebonite. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z But anyone who wants, any time, can disprove the whole principle of the induction coil. Sense from Thought Divide The highest notes are emitted by the high-tension discharges of an induction coil in which the arc is, so to speak, all surface. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z It's an old method; induction coils, condensers, and even gravity itself are storing energy by straining space. Islands of Space The induction coil with a high initial E. M. F. changes into a low electro-motive force. Electricity for Boys The mercury interrupter may be worked by a separate electromagnet or by the magnetism of the core of the induction coil. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z The combination of the two gases is now brought about by connecting the two platinum wires with an induction coil and passing a spark from one wire to the other. An Elementary Study of Chemistry The parts thus corresponded to the windings of an induction coil, the vacuum tubes being the secondary, and the tubes filled with mercury the primary. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z A torus-shaped induction coil encloses all its magnetic field within it; the torus, or 'doughnut' coil, has a perfectly enclosed magnetic field. Islands of Space Mechanism for making and breaking circuits in induction coils or other apparatus. Electricity for Boys In applying the Wehnelt break to an induction coil, the condenser is discarded and also the ordinary hammer break, and the Wehnelt break is placed in circuit with the primary coil. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z Such things as the storage battery, the electro-static condenser, the induction coil, or plain heat storage, are worthless to us. The Black Star Passes Generally it was necessary to transform upward, when the e. m. f. was very low, and usually an ordinary form of induction coil was employed, but sometimes the arrangement illustrated in Fig. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z Arcot pointed out the places where they could be put; also, he replaced some of the old induction coils with one of his new storage cells and got far higher efficiency from the tubes. Islands of Space One of the two coils in a transformer, or induction coil. Electricity for Boys As already explained, the applicability of the induction coil in wireless telegraphy is limited by the fact of the high resistance of the secondary circuit and the small current that can be supplied from it. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z Is there anything wrong, or is a condenser different from an induction coil? Scientific American, Volume 40, No. 13, March 29, 1879 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures I join the terminals of the secondary coil to these terminals and insert the primary p, between the insulated plate P1, and the terminal T1, of the induction coil as before. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z Unlike the ordinary induction coil, it isn't necessary to keep supplying power to the thing; it's a static condition. Islands of Space Two coils, side by side, are always used to show an induction coil, and a condenser is generally shown, as illustrated, by means of a pair of forks, one resting within the other. Electricity for Boys Where large condensers have to be charged—in other words, where we have to deal with larger powers—we are obliged to discard the induction coil and to employ the alternating-current transformer. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z For complete directions for making induction coils, see Scientific American Supplement No. 160. Scientific American, Volume 40, No. 13, March 29, 1879 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures This I effect by rendering the discharges through the primary of the induction coil less frequent, and also by diminishing the rapidity of the vibration in the secondary. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z H. D. Ruhmkorff, an able and learned chemist, discovered the induction coil. A Journey to the Centre of the Earth Wireless Receiving Apparatus The Receiving Apparatus.—The receiving station, on the other hand, has neither condenser, induction coil, nor key. Electricity for Boys This experiment demonstrates that the effect of compressing the air round the secondary terminals of the induction coil is to greatly increase the difference of potential between these balls before the spark passes. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z Is there heat enough developed in the secondary coil of an induction coil to prevent the use of paraffine as an insulating material? Scientific American, Volume 40, No. 13, March 29, 1879 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures Plate VII, comprises two sparking induction coils and a rapidly revolving metallic drum driven by a small motor, the periphery of the drum having a thin coating of lampblack. Transactions of the American Society of Civil Engineers, vol. LXX, Dec. 1910 Federal Investigations of Mine Accidents, Structural Materials and Fuels. Paper No. 1171 They may be used either with or without induction coils. Scientific American Supplement, No. 508, September 26, 1885 The platinum wires at the two ends are connected with the positive and negative wires or terminals of an induction coil. Notable Events of the Nineteenth Century Great Deeds of Men and Nations and the Progress of the World The induction coil, therefore, serves the double purpose of a step-up transformer to limit line losses and a device for vastly increasing the range of change in the transmitter circuit. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. Can you recommend any insulating material for making induction coils which will dry rapidly? Scientific American, Volume 40, No. 13, March 29, 1879 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures Copper disks were pressed against the seeds, the disks were connected with the poles of an induction coil, the current was kept on for one or two minutes and immediately afterward the seeds were sown. Scientific American Supplement, No. 841, February 13, 1892 The parts thus corresponded to the windings of an induction coil, the vacuum tubes being the secondary and the tubes filled with the mercury the primary. Scientific American Supplement, No. 810, July 11, 1891 Telephonic currents—that is, currents induced in the secondary wire of an induction coil due to the variation of microphonic currents in the primary wire—are not alternating currents. Scientific American Supplement No. 822, October 3, 1891 An induction coil is merely a transformer, and for the use under discussion consists of two insulated wires wound around an iron core. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. In this case the vacuum bulb is charged from Leyden jars which, in their turn, are excited by an induction coil. McClure's Magazine, Vol. 6, No. 5, April, 1896 In addition, the source employed was not the Holtz machine, but the pile with induction coil. Scientific American Supplement, No. 483, April 4, 1885 In the interior of these houses the wires, as well as the induction coils, are insulated and applied to the walls. Scientific American Supplement, No. 455, September 20, 1884 Usually in operating an induction coil we have set up a vibration of moderate frequency in the primary, either by means of an interrupter or break, or by the use of an alternator. Experiments with Alternate Currents of High Potential and High Frequency The winding of the induction coil which is in series with the transmitter and the battery is called the primary winding; the other is called the secondary winding. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. In making this picture, Professor Pupin excited his tube by means of a powerful Holtz machine, thus following Dr. Morton in the substitution of statical electricity for the more common induction coil. McClure's Magazine, Vol. 6, No. 5, April, 1896 Finally, the pellicle was put in contact with the upper conductor, L, which terminated in a ball and was connected with the other pole of the induction coil. Scientific American Supplement, No. 483, April 4, 1885 Beside me was a large induction coil, and above it two huge plates of copper about ten feet apart. The Certainty of a Future Life in Mars In operating an induction coil with rapidly alternating currents, we realize with astonishment, for the first time, the great importance of the relation of capacity, self-induction and frequency as regards the general result. Experiments with Alternate Currents of High Potential and High Frequency The hook switch is provided with another upper contact 6, between which and the contact 5 is connected the local circuit containing the transmitter, the battery, and the primary of the induction coil in series. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. Suiting the action to the words, he deftly touched here a button, there a lever; and all at once a shrill buzzing rose above the lower drone of the induction coils. The Air Trust The current from this battery is converted into a current of high tension by means of a strong induction coil capable of giving sparks more than eight inches in length. Scientific American Supplement, No. 483, April 4, 1885 The telephone receivers can be used both as receivers and transmitters, or ordinary telephone transmitters, induction coils and battery may be used in the circuit with a receiver. The Boy Mechanic: Volume 1 700 Things for Boys to Do A long arc is established between the terminals A B of the first induction coil. Experiments with Alternate Currents of High Potential and High Frequency This consists of the operator's transmitter and receiver, induction coil, and battery connections together with the wiring and other associated parts necessary to co-ordinate them with the rest of the apparatus. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. He grounded his wires and sent high currents into the earth, but improved his system and took another step toward the final achievement by adding a large induction coil to his sending equipment. Masters of Space Morse, Thompson, Bell, Marconi, Carty "The inventor has described an accident he suffered and its effect on him: "'In the laboratory,' he says, 'I had a large induction coil. Radio Boys Cronies Or, Bill Brown's Radio A good sized induction coil was through connected with these wires and about six dry batteries were used to run the induction coil whenever a push button was manipulated. The Boy Mechanic: Volume 1 700 Things for Boys to Do When the coil is set to work, the potential of the sphere is alternated, and the small helix now behaves as though its free end were connected to the other terminal of the induction coil. Experiments with Alternate Currents of High Potential and High Frequency Associated with the secondary winding of her receiver is a primary circuit containing a transmitter, battery, and the primary of the induction coil. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. The comparatively feeble batteries which had furnished the currents used in the earlier efforts were replaced with great power-driven dynamos, and converters were used instead of the induction coil. Masters of Space Morse, Thompson, Bell, Marconi, Carty From time to time the operator, advised by the sparking of his induction coils, would put on the diadem with ear pieces in order to listen to his far-away comrades. Mare Nostrum (Our Sea) A Novel In the wiring diagram, A is the circuit breaker; B, the induction coil, and C, the battery. The Boy Mechanic: Volume 1 700 Things for Boys to Do This is the action occurring in any induction coil whose primary wire is traversed by alternating currents, and whose secondary wire is closed either upon itself directly or through a resistance. Scientific American Supplement, No. 601, July 9, 1887 Fluctuating currents generated by the transmitter at the calling station, for instance, are converted by means of the induction coil into alternating currents flowing in the secondary of the induction coil at that station. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. They had accordingly installed huge induction coils and sent currents of two thousand volts over the line. Masters of Space Morse, Thompson, Bell, Marconi, Carty Marconi's transmitting apparatus consisted of electric batteries, an induction coil by which the force of the current is increased, a telegrapher's key to make and break the circuit, and a pair of brass knobs. Stories of Inventors The Adventures of Inventors and Engineers The induction coil used for this purpose should give a spark about 1/2 in. long or more. The Boy Mechanic: Volume 1 700 Things for Boys to Do The high-resistance secondary circuit of an induction coil is located in circuit between the condensing surface and the ground. Edison, His Life and Inventions What are the principal parts of an induction coil? Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. The necessary variations in the electrical currents are usually produced by means of a microphone attached to a thin diaphragm upon which the voice acts, and are intensified by means of an induction coil. The Gutenberg Webster's Unabridged Dictionary Section T, U, V, and W The batteries were connected with the induction coil, which in turn was connected with the brass knobs; the telegrapher's key was placed between the battery and the coil. Stories of Inventors The Adventures of Inventors and Engineers It consists of a small induction coil that can be constructed at home. The Boy Mechanic: Volume 1 700 Things for Boys to Do In this laboratory I had a large induction coil which I had borrowed to make some experiments with. Edison, His Life and Inventions What is the function of an induction coil in telephony? Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. The line is connected to the secondry circuit of the induction coil. Scientific American Supplement, No. 362, December 9, 1882 A power-driven dynamo took the place of the more feeble batteries at Poldhu, converters to increase the power displaced the induction coil, and many sending-wires, or antennae, were used instead of one. Stories of Inventors The Adventures of Inventors and Engineers After I connected up my induction coil, as shown in the sketch, we were not bothered with them. The Boy Mechanic: Volume 1 700 Things for Boys to Do The current usually used is the Faradic; the induced alternate current from an induction coil. Steam, Steel and Electricity Give conventional symbols of induction coils and repeating coils. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. The electro-magnet is, then, not inserted in the line at all, but in the primary circuit of an induction coil, and connected with a local battery. Scientific American Supplement, No. 362, December 9, 1882 In 1851, Ruhmkorff constructed an induction coil so greatly improved, by the careful insulation of its secondary circuit, that he could obtain from it torrents of long sparks in ordinary air. Beacon Lights of History, Volume 14 The New Era; A Supplementary Volume, by Recent Writers, as Set Forth in the Preface and Table of Contents Divested of nearly all technical phrases, an induction coil may be briefly described as a step-up transformer of small capacity. The Boy Mechanic: Volume 1 700 Things for Boys to Do It was a marked advance when the gaslights in a theater could be all lighted at once by means of batteries and the spark of an induction coil. Steam, Steel and Electricity What is the function of the induction coil in the telephone circuit? Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. The voltage of the grid of the modulator tube is varied by the secondary coil of the induction coil or microphone transformer, above described. The Radio Amateur's Hand Book The Ruhmkorff induction coil has in late years been greatly improved both by Tesla and Elihu Thomson, who, separately and independently of each other, have produced excellent forms of high-frequency induction coils. Beacon Lights of History, Volume 14 The New Era; A Supplementary Volume, by Recent Writers, as Set Forth in the Preface and Table of Contents It is useful for running induction coils, or small electric motors. The Boy Mechanic: Volume 1 700 Things for Boys to Do He set up the waves in the ether by means of an electrical discharge from an induction coil. Marvels of Modern Science His method is to introduce an induction coil between the line and the transmitter, its function being to translate the variation of the direct current controlled by the transmitter into true alternating currents. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. A condenser also has a reactance effect on an alternating current but different from an induction coil the lower the frequency the greater will be the reactance. The Radio Amateur's Hand Book This is the principle of the "induction coil" so much employed in medical electricity, and of the "transformer" or "converter" used in electric illumination. The Story of Electricity It is therefore undesirable for electric bells, induction coils and all other open-circuit apparatus. The Boy Mechanic: Volume 1 700 Things for Boys to Do Up to this time the only appliances employed were induction coils giving a ten or twenty inch spark. Marvels of Modern Science The circuit containing the battery, transmitter, and primary winding of the induction coil is called the local circuit. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. A faintly luminous discharge that takes place from the positive pointed terminal of an induction coil, or other high potential apparatus; is termed a brush discharge. The Radio Amateur's Hand Book It is particularly observed at the starting and stopping of a current, and gives rise to what is called the "extra-spark" seen in breaking the circuit of an induction coil. The Story of Electricity The transmitter consists of an induction coil, about the size used for automobiles, a key or push-button for completing the circuit, and five dry batteries. The Boy Mechanic: Volume 1 700 Things for Boys to Do M. Ruhmkorff is a learned and most ingenious man of science; his great discovery is his induction coil, which produces a powerful stream of electricity. A Journey to the Interior of the Earth The relation between the windings of the induction coil in this practice are such that the secondary winding contains many more turns than the primary winding. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. Get a standard telephone induction coil that has a resistance of 500 or 750 ohms and this will cost you a couple of dollars. The Radio Amateur's Hand Book It is fitted up inside the box, together with an induction coil, and M is the mouthpiece for speaking to it. The Story of Electricity These were connected to terminals of an induction coil. The Boy Mechanic: Volume 1 700 Things for Boys to Do By turning a switch, I established contact between the induction coil and the glass spiral, and the sea, lit up by our four lanterns, was illuminated for a radius of twenty–five meters. Twenty Thousand Leagues Under the Sea The primary current was transformed by an induction coil of the ordinary type and the transformed current was sent through a non-inductive resistance of 3,000 ohms. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. The Microphone Transformer.—This is an induction coil that is designed especially for wireless telephone modulation. The Radio Amateur's Hand Book There is some prospect of the luminosity excited in a vacuum tube by the alternating currents from a dynamo or an induction coil becoming an illuminant. The Story of Electricity To those who would like to try the experiment I will say that my outfit consisted of an induction coil with a 3/8-in. iron core about 3 in. long. The Boy Mechanic: Volume 1 700 Things for Boys to Do An induction coil gathers the electricity generated and directs it to a specially designed lantern. Twenty Thousand Leagues Under the Sea The advantages to be gained by employing a local battery at each subscriber's station associated with the transmitter in the primary circuit of an induction coil are attended by certain disadvantages from a commercial standpoint. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. As with the telephone induction coil, the microphone transmitter is connected in series with the primary coil and a 6 volt dry or storage battery. The Radio Amateur's Hand Book Other electric gas-lighters consist of metal points placed on the burner, so that the electric spark from a small induction coil or dynamo kindles the jet. The Story of Electricity Connect the Leyden jar to the induction coil as shown in the diagram. The Boy Mechanic: Volume 1 700 Things for Boys to Do Was it in the extraordinary voltage obtained from some new kind of induction coil? Twenty Thousand Leagues Under the Sea Variations in the resistance of the transmitter when in action, cause complementary variations in the supply current flowing through the primary of the induction coil. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. This coil is placed over the upper end of the magnet and its terminals are connected to the secondary of the induction coil. The Radio Amateur's Hand Book Explosives, such as gunpowder and guncotton, are also ignited by the electric spark from an induction coil or the incandescence of a wire. The Story of Electricity If this plan failed, I had intended placing the pigeons within an induction coil, so as to disturb any magnetic or dia-magnetic sensibility, which it seems just possible that they may possess. Life and Letters of Charles Darwin — Volume 2 It consists essentially of an induction coil attached either to cells or a street-current plug for generating the electricity, a focus tube, and a phosphorescence screen. A History of Science — Volume 3 It is seen that the primary of the induction coil and the transmitter are included in series across the line. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. He used an induction coil to energize the spark gap, and a telegraph key in the primary circuit to break up the current into signals. The Radio Amateur's Hand Book Hittorf and others improved on this effect by employing the spark from an induction coil and large tubes, highly exhausted of air, or containing a rare infusion of other gases, such as hydrogen. The Story of Electricity The receiver, transmitter, and primary Page 193 winding of the induction coil are, however, included in a local circuit with the condenser. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. This instrument was ordinarily mounted in a wooden box together with the induction coil, which is shown in the upper portion of the figure. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. The secondary of the induction coil, in series with the receiver, is connected also across the line in series with a condenser and the transmitter. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. A quenched spark gap not only eliminates the noise of the ordinary gap but, when properly designed, it increases the range of an induction coil set some 200 per cent. The Radio Amateur's Hand Book Connected between the two limbs of the line at the substation there is also the receiver and the secondary of an induction coil in series. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. The use and advantages of the induction coil in so-called local-battery telephone sets have already been explained in previous chapters. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. The so-called repeating coil used in telephony is really nothing but an induction coil. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. Immediately in front of the ringer magnets is the induction coil. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. A simple transmitting set with an induction coil is shown in Fig. The Radio Amateur's Hand Book When the hook is raised, however, this path is closed through the receiver and secondary of the induction coil, the primary circuit being also closed so as to include the battery and transmitter. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. The ordinary symbol for the induction coil used in local battery work is shown in Fig. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. At the subscriber's station the line circuit passes through the secondary of an induction coil and the transmitter. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. The function of the induction coil in telephony is, therefore, mainly one of transformation, that is, either of stepping up the voltage of a current, or in other cases stepping it down. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. It may be stated, therefore, that the design of induction coils is nearly always carried out by "cut-and-try" methods, bringing to bear, of course, such scientific and practical knowledge as the experimenter may possess. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. In this case, however, a local circuit is provided at the substation, in which is placed a storage battery 1 and the primary 2 of an induction coil, together with the transmitter. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. Immediately below this on the backboard was mounted the transmitter arm, and sometimes the base of this included the induction coil. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. Other companies mount only the transmitter, receiver, and hook switch on the desk stand proper and put the condenser or induction coil, or other device associated with the talking circuit, in the bell box. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. An induction coil consists of two or more windings of wire interlinked by a common magnetic circuit. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. The component Page 218 parts of a common-battery telephone, whether of the wall or desk type, are the transmitter, receiver, hook switch, polarized bell, condenser, and sometimes an induction coil. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. |
| 随便看 |
英语例句辞典收录了117811条英语例句在线翻译词条，基本涵盖了全部常用单词及词组的例句翻译及用法，是英语学习的有利工具。