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 28
Página 19
... disc of copper , then on this a disc of zinc , and over these a similar sized disc of damp cloth ; and by continuing to pile up discs of these materials , in the same order , copper , zinc , cloth , until he had a sufficient number . He ...
... disc of copper , then on this a disc of zinc , and over these a similar sized disc of damp cloth ; and by continuing to pile up discs of these materials , in the same order , copper , zinc , cloth , until he had a sufficient number . He ...
Página 20
... disc at the bottom . These experiments may be repeated ad infinitum even after the pile has been mounted some hours , provided the cloth retains some moisture . 3rd . It produces chemical effects with an energy propor- tional to the ...
... disc at the bottom . These experiments may be repeated ad infinitum even after the pile has been mounted some hours , provided the cloth retains some moisture . 3rd . It produces chemical effects with an energy propor- tional to the ...
Página 29
... 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 ...
... 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 ...
Página 57
... discs over which the pointers move are provided with ivory pegs to limit the deflections on each side of the vertical line . These discs are sometimes made circular , and may then be turned round in the dial - plate , enabling the ...
... discs over which the pointers move are provided with ivory pegs to limit the deflections on each side of the vertical line . These discs are sometimes made circular , and may then be turned round in the dial - plate , enabling the ...
Página 86
... upon the paper * Mr. Morse informs us that a similar construction was suggested by him , and is contained in his patent of 1837 . strip by means of a small circular disc of metal 86 THE ELECTRIC TELEGRAPH . Direct-working Recorders.
... upon the paper * Mr. Morse informs us that a similar construction was suggested by him , and is contained in his patent of 1837 . strip by means of a small circular disc of metal 86 THE ELECTRIC TELEGRAPH . Direct-working Recorders.
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...