| 单词 | electroscope |
| 例句 | Because the glass rod is an insulator, it must actually touch the electroscope to transfer charge to or from it. College Physics for AP Courses 2015-08-12T00:00:00Z What happens to the charged electroscope when a conductor is moved between its plastic sheets, and why? Anatomy and Physiology 2013-06-19T00:00:00Z Learn how different materials around the house conduct static electricity--with a homemade electroscope! Static Science: How Well Do Different Materials Make Static Electricity? 2014-01-23T05:00:00Z On Its Centenary, Celebrating a Ride That Advanced Physics BAD SAAROW-PIESKOW, Germany — Precisely where Victor Hess, his electroscopes and his hot-air balloon touched down is a mystery. Essay: When Victor Hess Discovered Cosmic Rays in a Hydrogen Balloon 2012-08-07T19:02:21Z Such a difference is what a gold-leaf electroscope indicates for its gold leaves and the walls surrounding the air-space in which they are suspended. Lord Kelvin An account of his scientific life and work 2012-04-06T02:00:32.097Z Similarly, the electroscope can be negatively charged by contact with a negatively charged object. College Physics for AP Courses 2015-08-12T00:00:00Z In order to ascertain whether bodies are electrified or not, instruments called electroscopes are used. 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 principle is used in making an electroscope, which is a scientific instrument that detects electrical charges. Static Science: How Well Do Different Materials Make Static Electricity? 2014-01-23T05:00:00Z In its simplest form the electrometer is called the "electroscope." 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 As electroscopes used to be constructed, these walls were made of glass imperfectly covered, if at all, by conducting material, and the electroscope was quite indefinite and uncertain in its action. Lord Kelvin An account of his scientific life and work 2012-04-06T02:00:32.097Z In the first experiment the rod is brought in contact with the electroscope. College Physics for AP Courses 2015-08-12T00:00:00Z The gold leaf electroscope as shown in fig. 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 They do not fly to it because it gives them pleasure; the little metal leaves of an electroscope do not move apart because contact with each other displeases them. Morals and the Evolution of Man 2011-11-14T03:00:18.930Z The finer and more delicately poised a mechanism—whether it be chemical balance, galvanometer, electroscope or what not—the more sensitive is it to its surroundings. Household Administration Its Place in the Higher Education of Women 2011-07-20T02:00:13.547Z A simple form of electroscope is a gold leaf electroscope, illustrated below. Paris: City of Light and Cosmic Rays 2011-07-04T14:15:00.943Z In the second experiment the rod is only brought close to the electroscope but not in contact. College Physics for AP Courses 2015-08-12T00:00:00Z The gold leaf electroscope can be further used to indicate the kind of electricity on an excited body. 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 The galvanic pile employed in this electroscope is that invented by Zamboni. A Treatise on Meteorological Instruments Explanatory of Their Scientific Principles, Method of Construction, and Practical Utility 2011-06-19T02:00:15.717Z The general appearance of one form of electroscope is shown in fig. The New Gresham Encyclopedia Volume 4, Part 2: Ebert to Estremadura 2011-04-14T02:00:56.200Z Even well-insulated electroscopes will gradually lose charge due to the bombardment of external radiation. Paris: City of Light and Cosmic Rays 2011-07-04T14:15:00.943Z What is the net charge on the electroscope in the first experiment? College Physics for AP Courses 2015-08-12T00:00:00Z The leaves will be seen to diverge, even though the rod does not approach to within a foot of the electroscope. 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 electroscope is, beyond doubt, one of the most delicate ever constructed, and is well adapted to show small quantities of positive and negative electricity. A Treatise on Meteorological Instruments Explanatory of Their Scientific Principles, Method of Construction, and Practical Utility 2011-06-19T02:00:15.717Z When a charged body is brought near the electroscope the leaves become charged similarly by induction. The New Gresham Encyclopedia Volume 4, Part 2: Ebert to Estremadura 2011-04-14T02:00:56.200Z Left: A gold leaf electroscope, with a positive charge induced in the gold leaf. Paris: City of Light and Cosmic Rays 2011-07-04T14:15:00.943Z Is the net charge on the electroscope in the second experiment different from that of the first experiment? College Physics for AP Courses 2015-08-12T00:00:00Z For simplicity the electroscope, insulating stand and silk thread have been omitted. 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 Even then, Volta said his invention was indebted to, among others, Abraham Bennett, the 18th-century English clergyman who invented the gold-leaf electroscope. Children of Light by Gavin Weightman ? review 2011-04-01T23:05:04Z It may also be charged by conduction, i.e. by the direct transfer of a charge to the electroscope. The New Gresham Encyclopedia Volume 4, Part 2: Ebert to Estremadura 2011-04-14T02:00:56.200Z Touching the friction rod to the electroscope draws away all the negative charge and leaves the scope with a net positive charge. Paris: City of Light and Cosmic Rays 2011-07-04T14:15:00.943Z If you have charged an electroscope by contact with a positively charged object, describe how you could use it to determine the charge of other objects. College Physics for AP Courses 2015-08-12T00:00:00Z Another form of electroscope is the pith ball pendulum, 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 It will be found that as it does so the gold-leaves of the electroscope diverge, but collapse again if the ball is withdrawn. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z When we know the kind of charge, positive or negative, which has been given to the electroscope, an unknown charge can be tested. The New Gresham Encyclopedia Volume 4, Part 2: Ebert to Estremadura 2011-04-14T02:00:56.200Z It was then found that when the end plates of Volta’s pile were connected to an electroscope the leaves diverged either with positive or negative electricity. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z Specifically, what would the leaves of the electroscope do if other charged objects were brought near its knob? College Physics for AP Courses 2015-08-12T00:00:00Z First charge the gold leaves of the electroscope by touching the knob with a glass rod rubbed on silk. 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 the interior no trace of electric charge could be found when tested by electroscopes or other means. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z If the approach of the unknown charge causes a further divergence of the leaves, then it is of the same kind as that with which the electroscope is charged. The New Gresham Encyclopedia Volume 4, Part 2: Ebert to Estremadura 2011-04-14T02:00:56.200Z The uses of an electroscope are, first, to ascertain if any body is in a state of electrification, and secondly, to indicate the sign of that charge. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z Figure 18.12 An electroscope is a favorite instrument in physics demonstrations and student laboratories. College Physics for AP Courses 2015-08-12T00:00:00Z He covered a large box with tin foil14 and went inside with the most delicate electroscopes obtainable. 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 On the plate of a gold-leaf electroscope place a metal canister having a loose lid. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z He performed this test successfully with an electroscope, using the “condensing” technique he had invented more than a decade earlier. The Earliest Electromagnetic Instruments If, without removing the electrified body, the plate or knob of the electroscope is touched, the leaves collapse. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z There, some are transferred to the positive rod by touch, leaving the electroscope with a net positive charge. College Physics for AP Courses 2015-08-12T00:00:00Z To repeat the experiment in modified form, let an electroscope be placed beneath a bird cage or wire netting, as in fig. 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 If an insulated brass ball is touched against the first tray and then against the knob or plate of the electroscope, the gold leaves will diverge. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z The “effects” provided by Volta’s pile and crown-of-cups are therefore electroscope deflection, sparks, and shocks. The Earliest Electromagnetic Instruments To employ the electroscope as a means of detecting radioactivity, we have first to test the leakage quality of the electroscope itself. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z Electrostatic repulsion in the leaves of the charged electroscope separates them. College Physics for AP Courses 2015-08-12T00:00:00Z Let charged rods or other powerfully charged bodies be brought near the electroscope outside the cage. 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 If the ball is discharged and touched against the other tray, and then afterwards against the previously charged electroscope, the leaves will collapse. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z The logical consequence was his invention of the first electroscope, the versorium non magneticum, made of any metal, figured on p. On the magnet, magnetick bodies also, and on the great magnet the earth a new physiology, demonstrated by many arguments & experiments A third great use of the electroscope is therefore to detect electric conductivity either in the air or in any other body. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z Two experiments are performed using positively charged glass rods and neutral electroscopes. College Physics for AP Courses 2015-08-12T00:00:00Z The leaves will diverge, even though the charged ebonite rod does not approach to within a foot of the electroscope. 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 Experiment IV.—Place a tin canister on a warm tumbler and connect it by a wire with the gold-leaf electroscope. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z In some conjunctures we must keep the conductor raised and in communication with the electroscope, in order to observe certain phenomena which I shall presently describe: this method I call observation with a fixed conductor. The Eruption of Vesuvius in 1872 To detect electrification it is best to charge the electroscope by induction. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z However, while the rod is close, the electroscope is momentarily grounded and then the rod is removed. College Physics for AP Courses 2015-08-12T00:00:00Z The electroscope is not made to detect the presence of energy except when set free as electricity. Nature's Miracles, Volume 1 Familiar Talks on Science—World-Building and Life. Earth, Air and Water. The leaves of the electroscope will diverge with positive electricity. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z The motion was first observed by his wife, who called his attention to the phenomenon; and he very soon discovered that the thighs of a frog, skinned and suspended, made a very good electroscope. The Telephone An Account of the Phenomena of Electricity, Magnetism, and Sound, as Involved in Its Action The next improvement was the invention of simple forms of repulsion electroscope. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z To demonstrate this, use is made of an electroscope. A Brief Account of Radio-activity But they tell us that the electroscope does not show any signs of electrification in the evaporated moisture. Nature's Miracles, Volume 1 Familiar Talks on Science—World-Building and Life. Earth, Air and Water. V is a testing vessel in which an electroscope is placed. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 8 "Conduction, Electric" As he touched the ball of the electroscope the sheets of gold-leaf separated and stood apart at a right angle. Astounding Stories, May, 1931 In connexion with the modern study of radioactivity, the electroscope has become an instrument of great usefulness, far outrivalling the spectroscope in sensibility. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z An electroscope; I put it in here last night. Astounding Stories of Super-Science January 1931 He had some knowledge of the stream of electrons that discharged continuously from the light above, and he knew how they could charge an electroscope that would automatically discharge to produce motion. Astounding Stories, March, 1931 If a slow current of air is drawn by the water pump through the testing vessel, the charge on the electroscope will gradually leak away. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 8 "Conduction, Electric" As they climbed out, Carnes saw that one of them carried a portable radio sending set, while the other bore an electroscope and a rubber rod. Astounding Stories, May, 1931 If an electrified body is held near the gold-leaf electroscope the leaves diverge with electricity of the same sign as that of the body being tested. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z When this is tied to the end of a silk thread, we get the pith-ball electroscope, so much talked about in nearly every text-book on physics. How Two Boys Made Their Own Electrical Apparatus Containing Complete Directions for Making All Kinds of Simple Apparatus for the Study of Elementary Electricity They could fashion pinhead cameras and three-gram electroscopes or balances capable of measuring the pressure of electronic impacts. Empire I now show you by this electroscope that these charges are unlike in character. Scientific American Supplement, No. 647, May 26, 1888 At four hundred-yard intervals are men with electroscopes like this one. Astounding Stories, May, 1931 If the electroscope is insulated once more and the electrified body removed, the leaves again diverge with electricity of the opposite sign to that of the body being tested. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z Carbon will be found to make a most excellent electroscope, as it is light and a good conductor of electricity. How Two Boys Made Their Own Electrical Apparatus Containing Complete Directions for Making All Kinds of Simple Apparatus for the Study of Elementary Electricity Practical Application of Heat, Steam, and Electricity: Making a simple voltaic cell, an electro-magnet, and a simple electroscope. Ontario Teachers' Manuals: Nature Study When all was ready the terminals were connected to an electroscope, and the handle was moved so slowly that it occupied thirty seconds in moving one-half revolution, and at that point violent excitement appeared. Scientific American Supplement, No. 647, May 26, 1888 "Get your electroscopes out and spot him a hundred yards from this truck." Astounding Stories, May, 1931 The sign of charge is then determined by holding near the electroscope a glass rod rubbed with silk or a sealing-wax rod rubbed with flannel. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z Dr. Imoda, the assistant of Professor Mosso, has also conducted a number of experiments in the discharge of an electroscope, by means of "rays" issuing from the medium's body. The Problems of Psychical Research Experiments and Theories in the Realm of the Supernormal According to whether the ball is repelled or attracted, so is the electricity in the stone made evident, though the electroscope gives the better results. The Chemistry, Properties and Tests of Precious Stones A charge is given to the electroscope, and the time required for a given degree of collapse of the leaves noted. On Laboratory Arts Dr. Bird repeated the question at the next post and was told that the electroscope there was losing its charge in seven minutes. Astounding Stories, May, 1931 The spark gap consisted of a ball and a point, the ball being connected with the electroscope and the point with a battery of 200 dry cells. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z Some other very interesting facts have been observed by means of the electroscope. The Problems of Psychical Research Experiments and Theories in the Realm of the Supernormal Compounds of radium affect a photographic plate or electroscope even through layers of paper or sheets of metal. An Elementary Study of Chemistry The quartz electroscope is taken, and the insulating rod heated in the blow-pipe. On Laboratory Arts If I then touch the ball with it, the charge is transferred to the electroscope and causes the two sheets of gold-leaf to stand apart at an angle. Astounding Stories, May, 1931 When the spark passed the cells charged up the electroscope. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z I took the electroscope to the table in the corner; then placed it in the circle near the medium. The Problems of Psychical Research Experiments and Theories in the Realm of the Supernormal The spectroscope will detect a quantity of matter four million times smaller even than this; and the electroscope is a million times still more sensitive than the spectroscope. The Outline of Science, Vol. 1 (of 4) A Plain Story Simply Told The electroscope will now insulate well enough to show no appreciable collapse of the leaves in one or two hours' time. On Laboratory Arts If I bring a bit of radioactive substance, for instance, pitchblende, near the electroscope, the charge will leak rapidly. Astounding Stories, May, 1931 Philo I have invented a tuned electroscope that would be destroyed by such waves, so sensitive as to react only to waves from an inconceivable distance, beyond thirty-five million miles. The Flutter of the Goldleaf; and Other Plays I took the electroscope to the table in the corner of the room and tried to recharge it, but found I was unable to do so even after repeated trials. The Problems of Psychical Research Experiments and Theories in the Realm of the Supernormal By the side of gold leaf electroscopes we see a feather electroscope, which is fastened to its support by means of a silken thread. Scientific American Supplement, No. 1178, June 25, 1898 A sensitive gold-leaf electroscope is attached to the aluminium plate, and its image thrown upon the screen. The Birth-Time of the World and Other Scientific Essays The radio operator set up his device, while the other man rubbed his coat sleeve briskly with the hard rubber and then touched the ball of the electroscope with it. Astounding Stories, May, 1931 Jack ascertained these facts by touching an electroscope with a bit of balloon cloth of the kind used on the Wondership, and charged with 2,000 volts of electricity. The Boy Inventors' Radio Telephone At any rate, I found that I could now charge the electroscope; which done, I placed it on the floor as before within the circle, and asked that the disc should be touched lightly. The Problems of Psychical Research Experiments and Theories in the Realm of the Supernormal It is then coiled on a frame and its rate of discharge measured by the electroscope. Scott's Last Expedition Volume I There is a liberation of negative electrons at the surface of the aluminium; these, under the attraction of the positive body, are rapidly removed as ions, and the electroscope charges up positively. The Birth-Time of the World and Other Scientific Essays The rate of discharge of these electroscopes will give us a clue to the nearness of his device." nce you locate him, how do you propose to attack him?" Astounding Stories, May, 1931 A strong battery was to act at a distance upon an electroscope, and the dispatches were to be transmitted by the aid of a conventional vocabulary based upon the number of the electroscope's motions. Scientific American Supplement, No. 384, May 12, 1883 "But is it possible that Edith has not shown you the electroscope?" Equality Had we placed a very delicate electroscope in the contiguous strata of water, it might possibly have been influenced at the moment when the gymnotus seemed to direct its stroke elsewhere. Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 2 At any time in the drift, an electroscope exposed outside became rapidly charged. The Home of the Blizzard Being the Story of the Australasian Antarctic Expedition, 1911-1914 Really a very sensitive gold leaf electroscope, devised by one of the students of Madame Curie. The War Terror Does the feeble electric conductivity always observed in the air contained within the walls of an electroscope depend on ionizing radiations from the material of the walls themselves? Darwin and Modern Science Now, as I recalled it, my mind reverted with an impulse of boundless curiosity to the electroscope and the processes by which it performed its miracles. Equality We could have heard the examination just as well without the electroscope, but I thought you would be better entertained if you could both see and hear. Equality An electroscope may be made of a strip of gold-leaf attached to an insulated brass plate and confined in a brass vessel with glass windows. Darwin and Modern Science It will pass through a considerable thickness of metallic foil, or many centimetres of air, and still affect photographic plates or discharge electroscopes. Darwin and Modern Science Is the "natural" leak of a brass electroscope due to an intrinsic radio-activity of brass, or to traces of a radio-active impurity on its surface? Darwin and Modern Science The perfection of our telephone and electroscope systems makes it possible to enjoy at any distance the instruction of any teacher. Equality |
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