Electricity and Its UsesReligious tract society, 1883 - 180 pagini |
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Pagina 18
... strength , or the quantity flowing per second , will be directly as the electro - motive force driving it , and inversely as the resistance it encounters . This relation is a fundamental one in the science of electricity , and is known ...
... strength , or the quantity flowing per second , will be directly as the electro - motive force driving it , and inversely as the resistance it encounters . This relation is a fundamental one in the science of electricity , and is known ...
Pagina 27
... of the coil B ' almost but not quite touching , we shall get a stream of sparks between the points of the wire . The sparks will be strongest when в is inside B ' , but their strength is only moderated. INDUCTION . 27.
... of the coil B ' almost but not quite touching , we shall get a stream of sparks between the points of the wire . The sparks will be strongest when в is inside B ' , but their strength is only moderated. INDUCTION . 27.
Pagina 28
John Munro (C.E.). inside B ' , but their strength is only moderated by separating the coil further apart . The apparatus shown is known as the " sledge " coil , because B ' can be slid along a graduated scale н н , so as to moderate the ...
John Munro (C.E.). inside B ' , but their strength is only moderated by separating the coil further apart . The apparatus shown is known as the " sledge " coil , because B ' can be slid along a graduated scale н н , so as to moderate the ...
Pagina 30
... strength of the current developed in this way depends of course on the power of the magnet and the resistance of the wire employed ; but with the same magnet and wire the current is stronger the quicker the wire is moved W FIG . 15 . S ...
... strength of the current developed in this way depends of course on the power of the magnet and the resistance of the wire employed ; but with the same magnet and wire the current is stronger the quicker the wire is moved W FIG . 15 . S ...
Pagina 48
... strengths , each capable of working a separate receiver . It was practically introduced for the first time by Messrs . Edison and Prescott , of America . These two American systems have been adapted into the English postal telegraphs ...
... strengths , each capable of working a separate receiver . It was practically introduced for the first time by Messrs . Edison and Prescott , of America . These two American systems have been adapted into the English postal telegraphs ...
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Termeni și expresii frecvente
accumulators action apparatus armature attracted axle bell bobbin brass brushes C. F. Varley cable candle carbon cathode charge clapper coil of wire conductor connected consists copper copper plate current flows current of electricity current passes cylinder decomposed deposited disc dynamo dynamo-electric machine earth Edison elec electric current electric lamps electric light electrified electro-magnet electro-plating employed excited fluid friction frictional electricity galvanometer glass Gramme machine heat hence hydrogen illustrated in Fig incandescent lamps Induction Balance induction coil insulated kind of electricity lever magnet metal microphone transmitter mirror galvanometer Morse motor negative pair paper pencil placed platinum wire polarise poles primary circuit Professor resistance ring rotated rubbed secondary sending shown in Fig Siemens signals silk silver SIPHON RECORDER soft iron solution sound spark station sulphuric acid surface telegraph line telephone traverses tricity vibrating voltaic battery voltaic pile wire zinc zinc plate
Pasaje populare
Pagina 103 - Son of his love ; in whom we have our redemption, the forgiveness of our sins: who is the image of the invisible God, the firstborn of all creation; for in him were all things created, in the heavens and upon the earth, things visible and things invisible, whether thrones or dominions or principalities or powers; all things have been created through him, and unto him; and he is before all things, and in him all things consist.
Pagina 60 - ... of the age, although it is not very well known, because only a few are required, and these are only to be seen abroad, if FIG. 23. we except those now being exhibited at the Crystal Palace, Sydenham. A general view of the instrument is given in Fig. 23, and the leading parts are detailed in Fig. 24. The principle of its action is just the reverse of the mirror galvanometer. In that instrument a tiny magnet moved within a fixed coil of wire ; in the siphon recorder a light coil of wire moves between...
Pagina 20 - Seebeck, that when two different metals are soldered together so as to form a closed ring or circuit, as at A in Fig 6, and one of the junctions is heated more than the other, an electric current is set up in the circuit. With one pair of junctions a very feeble current is produced, just as a single voltaic element gives a feeble current, but by combining a number of pairs in the fashion of B, Fig.
Pagina 10 - All things constructed as above, and the minute previously fixed, I begin the conversation with my distant friend in this manner. Having set the electrical machine a-going as in ordinary experiments, suppose I am to pronounce the word Sir; with a piece of glass or any other electric per se, I strike the wire S...
Pagina 32 - The magnetisation of a bar of steel or iron, according to this theory, consists in establishing within the metal by induction a series of electrical currents, all revolving in the same direction at right angles to the axis or length of the bar.
Pagina 5 - Hence we have the law that like kinds of electricity repel each other, and unlike kinds attract.
Pagina 13 - ... the supply of heat. No matter how long the connecting wire is, the current will flow through it, provided it is entire, and hence it is that we have telegraph lines two or three thousand miles long. The water in this combination supplies the oxygen to burn the zinc, and sulphuric acid is merely added to reduce the resistance of the water to the passage of the electricity through it, for the current starts from the zinc plate where the chemical action takes place, and flows to the copper plate...
Pagina 59 - The details of this needle are shown in the lower figure, where cc are sectionsthrough the coil, M is the magnet-needle, carrying in front of it a small mirror. This needle is enclosed in a small chamber, glazed by a lens G, and inserted in the hollow of the coil c. A curving magnet H is supported over the coil to adjust the position of the smaller magnet in the chamber.
Pagina 61 - ... coil of wire ; in the siphon recorder a light coil of wire moves between the poles of a powerful magnet. The signal currents pass through the suspended coil to earth, and in doing so the coil turns to left or right, according as the currents are positive or negative. These movements of the coil are communicated by a connecting thread to a fine glass siphon, which is constantly spurting ink upon a band of travelling paper, and hence the trace of the ink on the paper follows and delineates the...
Pagina 68 - Bell of improving the operation of his harmonic telegraph by causing the transmitting interrupters each to make and break the primary circuit of an induction coil, the secondary circuit of which could be placed in the main line by the depression of a key.