The History and Progress of the Electric Telegraph: With Descriptions of Some of the ApparatusD. Van Nostrand, 1869 - 280 páginas |
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Página xi
... Wire 86. Gintl's Method with Relays 115 • 87 . دو 99 by Chemical Means • 119 119 . 122 123 125 129 132 133 • 137 138 139 141 • 143 145 . 147 88. Plan of Frischen and Siemens . 89. Method of transmitting two Messages along a single Line ...
... Wire 86. Gintl's Method with Relays 115 • 87 . دو 99 by Chemical Means • 119 119 . 122 123 125 129 132 133 • 137 138 139 141 • 143 145 . 147 88. Plan of Frischen and Siemens . 89. Method of transmitting two Messages along a single Line ...
Página xiii
... Wire . 227 143 . " " 144 . Protection of Joints in 227 228 145. Erection of Overland Lines 231 146. Stays and Struts . Stretching the Line 231 147. Phenomenon of Charge in Wires 233 148. The Earth - plate 234 VII . SUBMARINE TELEGRAPH ...
... Wire . 227 143 . " " 144 . Protection of Joints in 227 228 145. Erection of Overland Lines 231 146. Stays and Struts . Stretching the Line 231 147. Phenomenon of Charge in Wires 233 148. The Earth - plate 234 VII . SUBMARINE TELEGRAPH ...
Página 3
... wires ; and in 1727 we find him em- ploying a wire 700 feet long , suspended in the air by silk threads , to one end of which he brought his excited glass tube , whilst another person at the other end observed the electrification . To ...
... wires ; and in 1727 we find him em- ploying a wire 700 feet long , suspended in the air by silk threads , to one end of which he brought his excited glass tube , whilst another person at the other end observed the electrification . To ...
Página 5
... wire . Winckler , in Leipsic , and Lemonnier , of Paris , in 1746 , and Dr. Watson , Bishop of Landaff . in 1747 ... wire leading to the prime conductor of a very powerful electrical machine , Muschen- brock removed the wire with his ...
... wire . Winckler , in Leipsic , and Lemonnier , of Paris , in 1746 , and Dr. Watson , Bishop of Landaff . in 1747 ... wire leading to the prime conductor of a very powerful electrical machine , Muschen- brock removed the wire with his ...
Página 6
... wire of several yards ' length were employed , the effect would be the same . And it was virtually to ascertain the maximum length of this wire that formed the purpose of those re- searches of Grey , Desaguilliers , Watson , and others ...
... wire of several yards ' length were employed , the effect would be the same . And it was virtually to ascertain the maximum length of this wire that formed the purpose of those re- searches of Grey , Desaguilliers , Watson , and others ...
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Términos y frases comunes
alphabet alternate currents armature arrangement atmospheric electricity attracted axis back contact beam cable clockwork closed coils of relay commutator connected consists construction contact peg contact-point copper core corresponding counteracting battery current passes currents arriving cylinder deflected dial direction disc discharge earth electric telegraph electricity electro-magnet employés frictional electricity galvanic galvanometer galvanoscope gutta percha holes horizontal inductor inserted insulated intermediate station interrupted length letters Leyden jar line battery line wire line-wire local battery magneto-electric means metal Morse apparatus motion needle negative current opposite station paper strip permanent magnet plate pointer polarised relay poles positive current posts pressed ratchet-wheel ratus receiving instrument receiving station reposing contact rest roller screw sending station shaft shown in Fig side Siemens signals soft-iron spiral spring style surface switch teeth telegraph terminal TERMINAL STATION tion tongue tooth tube turning type-wheel underneath vertical vulcanite wheel whilst zinc
Pasajes populares
Página 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...
Página 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.
Página 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.
Página 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...
Página 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...
Página 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.
Página 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...
Página 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.
Página 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...
Página 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...