The History and Progress of the Electric Telegraph: With Descriptions of Some of the ApparatusD. Van Nostrand, 1869 - 280 pàgines |
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The History and Progress of the Electric Telegraph: With Descriptions of ... Robert Sabine Visualització completa - 1869 |
The History and Progress of the Electric Telegraph: With Descriptions of ... Robert Sabine Visualització completa - 1869 |
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apparatus armature arrangement arriving attached attracted axis battery beam bottom cable carried charged circuit clockwork closed coating coils commutator connected consists construction continuation copper core corresponding covered cylinder deflected direction disc discharge earth effect electricity electro-magnet employed equal experiments force give given goes held holes inserted insulated interrupted iron length letter lever lifted magnet marked means metal method Morse motion moved necessary needle operator opposite passes permanent piece placed plate poles positive posts pressed prevent printing receiving relay released remains resistance rest round screw sending shaft shown side Siemens signals single space spring station stop strip style supported surface switch teeth telegraph terminal tion tongue translation transmitting tube turning type-wheel upper vertical wheel whilst wire
Passatges populars
Pàgina 11 - 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 words they indicate : from which it appears that he has formed an alphabet of motions. As the...
Pàgina 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.
Pàgina 30 - When the contact was made, there was a sudden and very slight effect at the galvanometer, and there was also a similar slight effect when the contact with the battery was broken.
Pàgina 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...
Pàgina 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...
Pàgina 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.
Pàgina 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...
Pàgina 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.
Pàgina 9 - To prevent this objection, and save longer argument, lay over the wires from one end to the other with a thin coat of jeweller's cement. This may be done for a trifle of additional expense, and, as it is an electric per se, will effectually secure any part of the fire from mixing with the atmosphere. I am, etc., CM...
Pàgina 8 - At every twenty yards' end, let them be fixed in glass, or jeweller's cement, to some firm body, both to prevent them from touching the earth, or any other nonelectric, and from breaking by their own gravity. Let the electric gun-barrel be placed at right angles with the extremities of the wires, and about an inch below them. Also let the wires be fixed in a solid piece of glass, at six inches from the end ; and let that part of them which reaches from the glass to the machine have sufficient spring...