The History and Progress of the Electric Telegraph: With Descriptions of Some of the ApparatusD. Van Nostrand, 1869 - 280 pagini |
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Alte ediții - Afișează-le pe toate
The History and Progress of the Electric Telegraph: With Descriptions of ... Robert Sabine Vizualizare completă - 1869 |
The History and Progress of the Electric Telegraph: With Descriptions of ... Robert Sabine Vizualizare completă - 1869 |
Termeni și expresii frecvente
alphabet alternate currents armature arrangement atmospheric electricity attracted axis back contact beam bottom cable carried clockwork commutator connected construction contact-pins copper copying telegraphs core corresponding current passes currents arriving cylinder deflected dial direction disc earth electricity electro-magnet employés galvanic galvanometer galvanoscope gutta percha hemp holes horizontal inductor inserted insulated intermediate station interrupted knot length letter lever Leyden jar lifted line battery line wire line-wire local battery means metal method mètre Morse apparatus motion needle negative current oscillating paper strip permanent magnet plate pointer poles positive current posts pressed printing printing-press ratchet-wheel ratus receiving instrument receiving station relay released rest roller rotating round scape-wheel screw sending station shaft shown in Fig side Siemens signals soft-iron spiral spring style supported surface switch synchronism teeth terminal tion tongue tooth transmitting tube turning type-wheel underneath upper vertical vulcanite wheel whilst wire zinc
Pasaje populare
Pagina 11 - You write two or three words on a paper ; he takes it with him into a room, and turns a machine enclosed in a cylindrical case, at the top of which is an electrometer, a small fine pith ball : a wire connects with a similar cylinder and electrometer in a distant apartment, and his wife by remarking the corresponding motions of the ball, writes down the words they indicate, from which it appears that he has formed an alphabet of motions. As the length of the wire makes no difference in the effect,...
Pagina 5 - he felt himself struck in his arms, shoulders, and breast, so that he lost his breath, and was two days before he recovered from the effects of the blow and the terror.
Pagina 11 - ... a wire connects with a similar cylinder and electrometer in a distant apartment; and his wife, by remarking the corresponding motions of the ball, writes down the words they indicate; from which it appears that he has formed an alphabet of motions. As the length of the wire makes no difference in the effect, a correspondence might be carried on at any distance; within and without a besieged town, for instance; or for a purpose much more worthy, and a thousand times more harmless, between two...
Pagina 8 - An expeditious method of conveying intelligence." wire, from one place to another, without being sensibly abated by the length of its progress. Let, then, a set of wires, equal in number to the letters of the alphabet, be extended horizontally between two given places, parallel to one another, and each of them about an inch distant from that next to it. At every twenty yards...
Pagina 11 - ... he takes it with him into a room, and turns a machine inclosed in a cylindrical case, at the top of which is an electrometer, a small, fine, pith ball ; a wire connects with a similar cylinder and electrometer in a distant apartment ; and his wife, by remarking the corresponding motions of the ball, writes down the words they indicate ; from which it appears that he has formed an alphabet of motions. As the length of the wire makes no difference in the effect, a correspondence might be carried...
Pagina 9 - The same thing may be otherwise effected. Let the balls be suspended over the characters as before, but instead of bringing the ends of the horizontal wires in contact with the barrel, let a second set reach from the electrified...
Pagina 259 - ... the art of directing the great sources of power in nature for the use and convenience of man, as the means of production and of traffic in states.
Pagina 10 - In electricity he has made a remarkable discovery : you write two or three words on a paper ; he takes it with him into a room, and turns a machine inclosed in a cylindrical case, at the top of which is an electrometer, a small fine pith ball; a wire connects with a similar cylinder and electrometer in a distant apartment ; and his wife, by remarking the corresponding motions of the ball, writes down the...
Pagina 29 - Certain effects of the induction of electrical currents have already been recognized and described: as those of magnetization; Ampere's experiments of bringing a copper disc near to a flat spiral; his repetition with electro-magnets of Arago's extraordinary experiments, and perhaps a few others. Still it appeared unlikely that these could be all the effects which induction by currents could produce; especially as, upon dispensing with iron...
Pagina 201 - Lille and back, making a total distance of 336 miles. This, however, not being deemed sufficient for the purpose, several coils of wire wrapped with silk were obtained, measuring in their total length 746 miles, and were joined to the extremity of the wire returning from Lille; thus making one continuous wire measuring 1,082 miles.