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 46
Página 6
... 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 , to which we are ...
... 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 , to which we are ...
Página 7
... length , to the com- munication of intelligence . II . TELEGRAPHS BY FRICTIONAL ELECTRICITY . 11. In the Scot's Magazine for 1753 * is a letter to the editor , from a correspondent signing himself " C. M. , " to whom we must give the ...
... length , to the com- munication of intelligence . II . TELEGRAPHS BY FRICTIONAL ELECTRICITY . 11. In the Scot's Magazine for 1753 * is a letter to the editor , from a correspondent signing himself " C. M. , " to whom we must give the ...
Página 8
... 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 ...
... 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 ...
Página 9
... length of wire that has been tried hitherto , yet , as that has never exceeded some thirty or forty yards , it may be reasonably supposed that in a far greater length it would be remarkably diminished , and probably would be entirely ...
... length of wire that has been tried hitherto , yet , as that has never exceeded some thirty or forty yards , it may be reasonably supposed that in a far greater length it would be remarkably diminished , and probably would be entirely ...
Página 11
... length of the wire makes no difference in the effect , a correspondence might be carried on at any distance , within or without a besieged town , for instance , or for objects much more worthy of attention , and a thousand times more ...
... length of the wire makes no difference in the effect , a correspondence might be carried on at any distance , within or without a besieged town , for instance , or for objects much more worthy of attention , and a thousand times more ...
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...