The History and Progress of the Electric Telegraph: With Descriptions of Some of the ApparatusD. Van Nostrand, 1869 - 280 páginas |
Dentro del libro
Resultados 1-5 de 66
Página v
... signals . It is also no less difficult to conclude that an employment of frictional electricity to this purpose did not occur to Grey , Watson , Franklin , and others , but , from its apparently chimerical nature , it may , perhaps ...
... signals . It is also no less difficult to conclude that an employment of frictional electricity to this purpose did not occur to Grey , Watson , Franklin , and others , but , from its apparently chimerical nature , it may , perhaps ...
Página xi
... Signals 78. Varley's Translating Apparatus Siemens and Halske's 91 94 94 96 98 99 . 102 79. Polarised Ink - recorder as Submarine Key 106 80. The Translation Spring 109 81. Complete Submarine Board 110 · 82. Morse Apparatus worked by ...
... Signals 78. Varley's Translating Apparatus Siemens and Halske's 91 94 94 96 98 99 . 102 79. Polarised Ink - recorder as Submarine Key 106 80. The Translation Spring 109 81. Complete Submarine Board 110 · 82. Morse Apparatus worked by ...
Página 4
... idea of the transmission of signals for practical purposes , and with the pure curiosity of * Phil . Trans . , vol . lxi . , part i . , p . 340 . a physical experiment , made some capital attempts to ascer- 4 THE ELECTRIC TELEGRAPH .
... idea of the transmission of signals for practical purposes , and with the pure curiosity of * Phil . Trans . , vol . lxi . , part i . , p . 340 . a physical experiment , made some capital attempts to ascer- 4 THE ELECTRIC TELEGRAPH .
Página 8
... signal given , or from choice , I stop the machine ; and taking up the pen in my turn , I write down whatever my friend at the other end strikes out . " If anybody should think this way tiresome , let him , instead of the balls ...
... signal given , or from choice , I stop the machine ; and taking up the pen in my turn , I write down whatever my friend at the other end strikes out . " If anybody should think this way tiresome , let him , instead of the balls ...
Página 9
... signals by discharging them , as well as that of reading signals by sound of bells , both of which , long years afterwards , were brought , with certain modifica- tions , into practice , deserve to be remembered to his credit . * 12. To ...
... signals by discharging them , as well as that of reading signals by sound of bells , both of which , long years afterwards , were brought , with certain modifica- tions , into practice , deserve to be remembered to his credit . * 12. To ...
Contenido
1 | |
2 | |
5 | |
6 | |
7 | |
8 | |
9 | |
10 | |
11 | |
12 | |
14 | |
15 | |
18 | |
19 | |
20 | |
23 | |
25 | |
31 | |
37 | |
43 | |
61 | |
91 | |
101 | |
106 | |
145 | |
147 | |
156 | |
162 | |
171 | |
172 | |
178 | |
202 | |
208 | |
222 | |
223 | |
231 | |
263 | |
273 | |
275 | |
278 | |
Otras ediciones - Ver todas
Términos y frases comunes
alphabet alternate currents armature arrangement atmospheric electricity attracted axis back contact beam bottom cable carried clockwork coils commutator connected consists construction contact-pins copper core corresponding current passes currents arriving cylinder deflected dial direction disc drum electricity electro-magnet employés galvanic galvanometer galvanoscope gutta percha hemp holes horizontal inductor inserted insulated intermediate station interrupted iron wires knot length letter lever Leyden jar lifted line battery line wire line-wire local battery means Messrs metal method mètre Morse apparatus motion needle negative current opposite paper strip permanent magnet plate pointer poles positive current posts pressed printing printing-press ratchet-wheel ratus receiving station relay resistance roller rotating round scape-wheel screw sending station shaft shown in Fig side Siemens signals soft-iron spiral spring style surface switch synchronism teeth terminal tion tongue tooth transmitting tube turning type-wheel underneath upper vertical vulcanite wheel whilst wire zinc
Pasajes populares
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 11 - ... and his wife, by remarking the corresponding motions of the ball, writes down the words they indicate: from which it appears 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...