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 20
Página xiii
... Covering 156. 1865 and 1866 Atlantic Cables . 157. Submersion of Cables 158. Taking Bearings 159. Bottom of the Ocean 160. Soundings 161. Cable whilst sinking - Slack . VIII . UNDERGROUND TElegraphs . § 162. Underground System preferred ...
... Covering 156. 1865 and 1866 Atlantic Cables . 157. Submersion of Cables 158. Taking Bearings 159. Bottom of the Ocean 160. Soundings 161. Cable whilst sinking - Slack . VIII . UNDERGROUND TElegraphs . § 162. Underground System preferred ...
Página 27
... covered over a letter of the alphabet , which was exposed as soon as the needle was deflected . This telegraph was first exhibited in public , some years later than the date of its invention , by Mr. Alexander , of Edinburgh . He ...
... covered over a letter of the alphabet , which was exposed as soon as the needle was deflected . This telegraph was first exhibited in public , some years later than the date of its invention , by Mr. Alexander , of Edinburgh . He ...
Página 55
... coil of fine silk - covered wire , in the middle of which a small magnetic needle plays , having at the end of its axis the pointer seen on the outside face of the instrument . One end of the coil. THE ELECTRIC TELEGRAPH . 55.
... coil of fine silk - covered wire , in the middle of which a small magnetic needle plays , having at the end of its axis the pointer seen on the outside face of the instrument . One end of the coil. THE ELECTRIC TELEGRAPH . 55.
Página 67
... covered wire was insulated , and the other end , a , made to communicate with a battery , of * " Mémoire sur la Télégraphie Electrique , " 1850 . which the opposite pole was to earth , the instant THE ELECTRIC TELEGRAPH . 67.
... covered wire was insulated , and the other end , a , made to communicate with a battery , of * " Mémoire sur la Télégraphie Electrique , " 1850 . which the opposite pole was to earth , the instant THE ELECTRIC TELEGRAPH . 67.
Página 68
... covering , or by the dampness occasioned by contact with the earth ; and this view was subsequently confirmed by the experiments of Faraday and Wheatstone . Several arrangements have been proposed for rendering the return currents ...
... covering , or by the dampness occasioned by contact with the earth ; and this view was subsequently confirmed by the experiments of Faraday and Wheatstone . Several arrangements have been proposed for rendering the return currents ...
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...