Electricity and its usesReligious tract Society, 1883 - 180 pagini |
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Pagina xi
... CABLE . 30 33 16. - TELEGRAPH CIRCUIT 34 17. - VARLEY'S INSULATOR 36 18. - MORSE INK - WRITER 39 19. - MORSE INSTRUMENT 40 20. - POST OFFICE SOUNDER 41 21. - SINGLE NEEDLE INSTRUMENT 43 22. - DOUBLE CURRENT KEY • 44 23. - STATION ...
... CABLE . 30 33 16. - TELEGRAPH CIRCUIT 34 17. - VARLEY'S INSULATOR 36 18. - MORSE INK - WRITER 39 19. - MORSE INSTRUMENT 40 20. - POST OFFICE SOUNDER 41 21. - SINGLE NEEDLE INSTRUMENT 43 22. - DOUBLE CURRENT KEY • 44 23. - STATION ...
Pagina 7
... the conducting wire of telegraph cables ; while silk , india - rubber , gutta - percha , and paraffin wax , being non - conductors , are generally used to cover the copper wire so as to isolate or confine the INTRODUCTORY . 7.
... the conducting wire of telegraph cables ; while silk , india - rubber , gutta - percha , and paraffin wax , being non - conductors , are generally used to cover the copper wire so as to isolate or confine the INTRODUCTORY . 7.
Pagina 16
... cables and instruments , this compact little battery is very con- venient , and as it does not readily " polarise " it is also very reliable and constant . A recent addition to the catalogue of batteries is the iron cell of Mr. Alfred ...
... cables and instruments , this compact little battery is very con- venient , and as it does not readily " polarise " it is also very reliable and constant . A recent addition to the catalogue of batteries is the iron cell of Mr. Alfred ...
Pagina 33
... . In 1837 Messrs . Cooke and Wheat- stone applied their needle telegraph instrument to a D wire laid along the Great Western Railway , and in. GREAT EASTERN LAYING TELEGRAPH CABLE . The actual Morse instrument , as used in the postal.
... . In 1837 Messrs . Cooke and Wheat- stone applied their needle telegraph instrument to a D wire laid along the Great Western Railway , and in. GREAT EASTERN LAYING TELEGRAPH CABLE . The actual Morse instrument , as used in the postal.
Pagina 44
... receiver at the other end . FIG . 22 . Although the double current method of telegraphing is not much employed on land circuits , it is largely used on submarine cables , in conjunction with a very 44 ELECTRICITY AND ITS USES .
... receiver at the other end . FIG . 22 . Although the double current method of telegraphing is not much employed on land circuits , it is largely used on submarine cables , in conjunction with a very 44 ELECTRICITY AND ITS USES .
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Termeni și expresii frecvente
accumulators action adjusted apparatus armature arrangement attract balance battery becomes Bell bismuth bobbin body brass brushes cable called candle carbon carrying caused cell charge circuit coils conductor connected consists containing copper course direction disc dynamo earth effect electric current electric light electro-magnet employed equal excited fact flowing friction give glass heat hence incandescent induction insulated invented iron joined keep kind lamp letter light machine magnet means metal microphone moved needle negative pair passes pencil piece placed plate platinum points poles positive pressed primary produced Professor receiving resistance ring rotated round rubbed secondary sending sent separate serves short shown shown in Fig side signals silk silver SIPHON RECORDER soft solution sound spark speaking station strength strip supply surface takes telegraph telephone transmitter traverses turn vibration voltaic wire zinc
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Pagina 101 - 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 58 - ... 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 18 - 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 8 - 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 30 - 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 3 - Hence we have the law that like kinds of electricity repel each other, and unlike kinds attract.
Pagina 11 - ... 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 57 - 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 59 - ... 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 66 - 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.