| 单词 | ebonite |
| 例句 | It was a chromium affair with a heavy ebonite base—a useful weapon. And Then There Were None 1939-11-06T00:00:00Z In this apparatus the two sets of tin-foil coatings are glued on a plate of ebonite, and a similar plate which is rotated, and the coatings of which are charged as 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 This proves that the electrical condition of the excited ebonite and of the excited glass must be different; for had it been the same, the two balls would have repelled one another. Electric Bells and All About Them A Practical Book for Practical Men 2012-03-06T03:00:25.273Z The details of the receiving arrangement are as follows:—The coherer tube consists of an ebonite tube containing hard steel particles of a uniform size, placed in the adjustable space between two polished steel electrodes. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z The winding is usually covered and the ends capped with ebonite heads so that the core wires are not exposed. 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 Very fine metal filings were enclosed in a tube of ebonite and connected in a circuit with a battery and a galvanometer. The Story of Great Inventions 2011-10-05T02:00:16.353Z But besides the heating due to bombardment, some heating goes on undoubtedly in the dielectric, being apparently greater in glass than in ebonite. 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 Farther, it will be found that the rubber with which the ebonite or the glass rod have been excited has also acquired electrical properties, attracting the pith-ball, previously repelled by the rod. Electric Bells and All About Them A Practical Book for Practical Men 2012-03-06T03:00:25.273Z 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 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 The charge produced on glass by friction with silk is called positive; that produced on ebonite by friction with flannel is called negative. The New Gresham Encyclopedia Volume 4, Part 2: Ebert to Estremadura 2011-04-14T02:00:56.200Z Glass usually gives way much quicker than ebonite; when it is heated to a certain degree, the discharge suddenly breaks through at one point, assuming then the ordinary form of an arc. 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 At the farther extremity is an ebonite or boxwood collar ending in a rather wider metal ring. Electric Bells and All About Them A Practical Book for Practical Men 2012-03-06T03:00:25.273Z If we desire to insulate a metal ball to make it hold a charge of electricity, it is usual to do so by attaching it to a handle or stem of glass or ebonite. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z In front of them a disk of ebonite or glass, having carriers of metal fixed to its edge, was rotated by a winch. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z If now a glass rod be electrified by friction with silk, it will be found that it attracts the suspended electrified ebonite rod. The New Gresham Encyclopedia Volume 4, Part 2: Ebert to Estremadura 2011-04-14T02:00:56.200Z To observe this it is best to replace the usual terminals of the coil by two metal columns insulated with a good thickness of ebonite. 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 E, ebonite screen; F, focussing lens; G, shutter; O, condensing lens; L, Nernst lamp. Wireless Transmission of Photographs Second Edition, Revised and Enlarged 1919 Rub the sheet of ebonite vigorously with warm flannel and lay it rubbed side downwards on the top of the tray. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z On a rotating glass or ebonite disk were placed carriers of tin-foil or metal buttons Voss’s machine. against which neutralizing brushes touched. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z To use the electrophorus, the ebonite is given a negative charge by striking it with fur or flannel. The New Gresham Encyclopedia Volume 4, Part 2: Ebert to Estremadura 2011-04-14T02:00:56.200Z These turned-down ends rest in two holes drilled vertically in a non-conductor such as ebonite, about two or three inches apart. Soap-Bubbles and the Forces Which Mould Them As he moved imperceptibly closer to her, he saw the two priests beside the gray mechanism reaching toward knurled knobs of ebonite affixed to its side, beneath the spherical web of pulsing wires. The Door into Infinity Touch the tray with the finger for an instant, and lift up the ebonite without letting the hand touch the tray a second time. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z For the pitch or resin may be substituted a sheet of glass, ebonite, india-rubber or any other good dielectric placed upon a metallic sheet, called the sole-plate. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z The metal disc is then placed on top of the ebonite plate. The New Gresham Encyclopedia Volume 4, Part 2: Ebert to Estremadura 2011-04-14T02:00:56.200Z By introducing perforated shields of ebonite between the electrodes, so that the full current-density was only attained at the centres of the jets, these ill effects could be prevented. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 3 "Convention" to "Copyright" Many of the so-called insulators, such as mica, ebonite, indiarubber, and the insulating oils, paraffin, &c., decrease in resistivity with great rapidity as the temperature rises. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 8 "Conduction, Electric" If the electrified tray is touched with the sealing-wax or ebonite rod, it will not be discharged, but if touched with a metal wire, the hand, or a damp thread, it is discharged at once. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z Many modifications have been patented by Hermite, that of 1895 specifying the use of platinum gauze anodes, held in ebonite or other frames. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z This machine consists of two circular plates of glass or ebonite carrying equal even numbers of tinfoil sectors symmetrically placed on their outer surfaces. The New Gresham Encyclopedia Volume 4, Part 2: Ebert to Estremadura 2011-04-14T02:00:56.200Z On the return journey no contact would be made because only the ebonite face of the switch would touch P. The pendulum would thus receive an impulse every other vibration. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 5 "Clervaux" to "Cockade" The current from one or two voltaic cells is led to an ebonite drum turned by a motor or a hand-wheel and cord. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 8 "Conduction, Electric" Experiment III.—Let one tray be insulated as before, and the electrified sheet of ebonite held over it, but not allowed to touch the tray. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z At a signal from the inventor a sheet of ebonite, as a substitute for a supposed fog, two miles thick, was placed in front of the headlight. Astounding Stories, March, 1931 Since the ebonite is an insulator, no general neutralization of the positive induced charge on the lower side of the metal disc can take place. The New Gresham Encyclopedia Volume 4, Part 2: Ebert to Estremadura 2011-04-14T02:00:56.200Z The cases of the "A" batteries are made of hardwood, finished in an ebonite black. The Automobile Storage Battery Its Care And Repair Therefore, without further word to his visitors, he carefully pulled over the long ebonite handle of the switch, and, at the same instant, a tiny spot of bright light showed upon the transparent gauge. The White Lie If the ebonite is withdrawn without touching the tray, the latter will be found to be unelectrified. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z In a central hole of an ebonite casing is fixed a permanent magnet, M. The casing expands at one end to accommodate a coil of insulated wire wound about one extremity of a magnet. 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 In the study of static electricity, ordinary ebonite combs can be used to great advantage. How Two Boys Made Their Own Electrical Apparatus Containing Complete Directions for Making All Kinds of Simple Apparatus for the Study of Elementary Electricity An invisible wire connects these objects with a small hermetically closed battery, the ebonite case of which is about the size of a cigarette. Harper's Young People, December 2, 1879 An Illustrated Weekly On the edge of the table, before these lamps, was a switch, with black ebonite handle. The White Lie Again, if, whilst holding the electrified ebonite over the tray, we touch the latter for a moment and then withdraw the ebonite sheet, the tray will be found to be positively electrified. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z We will content ourselves with saying that the wax cylinder of the phonograph, or the ebonite disc of the gramophone, is generally rotated by clockwork concealed in the body of the machine. 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 addition of about fifty per cent. changes the rubber to a hard black substance known as "ebonite," or "hard rubber." Commercial Geography A Book for High Schools, Commercial Courses, and Business Colleges The very best quality of ebonite obtainable should be solely employed in constructing electric works. On Laboratory Arts One end of the stalk is held in ebonite forceps and vibrated. Response in the Living and Non-Living The electrified ebonite is said to act by “electrostatic induction” on the tray, and creates on it two induced charges, one of positive and the other of negative electricity. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z From it as many as 1,000 copies may be made on ebonite plates by combined pressure and heating. 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 two contact springs in communication at each aperture with the alarm and the line are connected by a strip of ebonite, M, against the center of which presses the button. Scientific American Supplement, No. 315, January 14, 1882 The advantage of using a polished ebonite surface is that such a surface deteriorates more slowly under the influence of light and air than a surface left rough from the tool. On Laboratory Arts Vibration may be imparted to either A or B by means of ebonite clip holders seen at the upper ends A B of the wire. Response in the Living and Non-Living The last goes to earth when the tray is touched, and the first remains when the tray is insulated and the ebonite withdrawn. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z Out of this "hard rubber" "vulcanite" or "ebonite" were made combs, hairpins, penholders and the like, and it has not yet been superseded for some purposes by any of its recent rivals, the synthetic resins. Creative Chemistry Descriptive of Recent Achievements in the Chemical Industries In front of the other opening of the tube is a horizontal fork of ebonite, whose arms carry on the side opposite the tube a metallic ball. Scientific American Supplement, No. 611, September 17, 1887 A complete cure, however, can only be effected by scraping off the outer layer of ebonite so as to expose a fresh surface. On Laboratory Arts Two pieces, from the same specimen of wire, are clamped separately at their lower ends by means of ebonite screws, in an L-shaped piece of ebonite. Response in the Living and Non-Living Charge positively a brass ball held on an ebonite stem, and introduce it, without touching, into the canister. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z This device, as shown in the accompanying illustration, is a glass cylinder fixed on an ebonite base, and closed at the top by an ebonite cap. Scientific American Supplement, No. 810, July 11, 1891 It is for this reason that Professor Wright has taken most of his shadow pictures through only the thickness of ebonite in his plate-holder. McClure's Magazine, Vol. 6, No. 5, April, 1896 For this purpose a bit of sheet glass broken so as to leave a curved edge is very useful, and the ebonite is then scraped like a cricket bat. On Laboratory Arts Then the photographic plate was entirely covered with a thin ebonite plate, above which there was a second one supported by small wedges, so as to allow air to circulate between them. Scientific American Supplement, No. 483, April 4, 1885 These terminals, as well as the communicating wires, are insulated with ebonite. Scientific American Supplement, No. 492, June 6, 1885 Opposite to this flat disk there is a brass strip secured to the ebonite cap. Scientific American Supplement, No. 810, July 11, 1891 From a photograph by Professor Arthur W. Wright of Yale College, taken through an ebonite plate-holder with fifty-five minutes exposure. McClure's Magazine, Vol. 6, No. 5, April, 1896 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 In the top of the case, as well as in the two sides, AD and BC, are apertures that are closed by ebonite cylinders through which slide, with slight friction, copper rods, HLN. Scientific American Supplement, No. 483, April 4, 1885 These are hermetically closed by an ebonite cover through which pass the tubes, B' C' and B C, that allow the liquid, E+E-E'+E', to circulate. Scientific American Supplement, No. 415, December 15, 1883 As a rule two cells are put up in ebonite or celluloid boxes and joined in series so as to give a 4-volt battery, the pressure for which sparking coils are generally designed. The Project Gutenberg Encyclopedia Volume 1 of 28 Piece of thin ebonite, such as is used for photographic plate-holder. McClure's Magazine, Vol. 6, No. 5, April, 1896 The seam may be strapped inside or at the ends by bits of ebonite acting as bridges, and the seam itself may be caulked with melted paraffin or anthracene. On Laboratory Arts My piles are arranged in ebonite vessels, A, which are flat, as in Fig. Scientific American Supplement, No. 385, May 19, 1883 Then recent experiments on the refractive power of ebonite were detailed—the rough results tending to give greater weight to Clerk-Maxwell's electro-magnetic theory of light. Scientific American Supplement, No. 288, July 9, 1881 To prevent the active material from being shaken out of the grids, corrugated and perforated ebonite separators are placed between the plates. The Project Gutenberg Encyclopedia Volume 1 of 28 A small brass wire passes through the selenium in each hole, without, however, touching the plate, on to the rectangular and vertical ebonite plate, B, Fig. Scientific American Supplement, No. 275, April 9, 1881 A represents an ebonite ring into which the wire coil is cemented by means of paraffin. On Laboratory Arts The platinoid wire is insulated and the covering of silk that insulates it is wound on the ebonite bobbins just where my finger is. A Portrait of the Artist as a Young Man Consequently a bit of ebonite of about the required size is first cut from the stock sheet by a hack-saw such as is generally used for metals. On Laboratory Arts With pieces of ebonite such as are used for the tops of resistance boxes, measuring, say, 20 X 8 X 11 inches, very little trouble is experienced. On Laboratory Arts The ebonite is softened and bent round it; this may require two or three operations, for the ebonite gets stiff very quickly after it is taken out of the water. On Laboratory Arts B B B B are quartz pins, with heads inside the ebonite ring. On Laboratory Arts The bath and its contents are allowed to cool together, so that the ebonite cools uniformly. On Laboratory Arts This is on account of the fact that ebonite sometimes springs a little out of shape when the skin is removed. On Laboratory Arts It is easy to make large tubes out of sheet ebonite by taking advantage of the softening which ebonite undergoes in boiling water. On Laboratory Arts In turning or shaping ebonite sheets it is as well to begin by taking the skin off one side first, and then reversing the sheet, finishing the second side, and then returning to the first. On Laboratory Arts At the temperature of boiling water the ebonite becomes somewhat softened, so that it is readily bent into any desired shape; on cooling it resumes its original hardness. On Laboratory Arts Turned work in ebonite, if well done, requires no sand-papering, but may be sufficiently polished by a handful of its own shavings and a little vaseline. On Laboratory Arts When this happens the ebonite may be improved by scrubbing with hot water, or washing freely with alcohol rubbed on with cotton waste in the case of apparatus that cannot be dismounted. On Laboratory Arts In designing apparatus for laboratory use it is as well to bear in mind that sooner or later the ebonite parts will require to be taken down and scraped up. On Laboratory Arts The insulation of the heavy copper connectors is by means of ebonite. On Laboratory Arts The sheet ebonite as it comes from the makers is generally far from flat. On Laboratory Arts At ordinary temperatures ebonite is hard and brittle and breaks with a well-marked conchoidal fracture. On Laboratory Arts These tools should be as hard as possible, for the edges are apt to suffer severely, and blunt tools leave a very undesirable woolly surface on the ebonite. On Laboratory Arts It is not possible, on the other hand, to use the carpenter's plane with success, for the angle of the tool is too acute and causes the ebonite to chip. On Laboratory Arts After cleaning the pumice off by means of water and a rag, the final touch may be given by means of vaseline, applied on cloth or on ebonite shavings. On Laboratory Arts It is often necessary to flatten a sheet of ebonite, and of course this is the more easily accomplished the smaller the sheet. On Laboratory Arts |
| 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。