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 29
Página 39
... turning them from right to left , the alternate currents , or all those going in one direction only , passed through the line , and , on turning them backwards . or from left to right , only those currents in the opposite direction were ...
... turning them from right to left , the alternate currents , or all those going in one direction only , passed through the line , and , on turning them backwards . or from left to right , only those currents in the opposite direction were ...
Página 49
... turning on the axis , supported by uprights which were screwed into a small Fig . 21 . block of dry wood . The screw on the longer arm of the lever was pressed upon the front contact , whilst the similar screw in the shorter arm was ...
... turning on the axis , supported by uprights which were screwed into a small Fig . 21 . block of dry wood . The screw on the longer arm of the lever was pressed upon the front contact , whilst the similar screw in the shorter arm was ...
Página 52
... turning the spoke - wheel , and it was wished to signal the letter opposite the spoke taken hold of . The receiving instrument or indicator was formed by a dial having thirty divisions corresponding to the letters , nume- rals , & c ...
... turning the spoke - wheel , and it was wished to signal the letter opposite the spoke taken hold of . The receiving instrument or indicator was formed by a dial having thirty divisions corresponding to the letters , nume- rals , & c ...
Página 53
... turning the shaft , the cores of c c ' at the same moment approached , and left the poles of the perma- nent magnet . The ends of the coils of wire round the They were so B B Fig . 22 . electro - magnet were connected , by means of a ...
... turning the shaft , the cores of c c ' at the same moment approached , and left the poles of the perma- nent magnet . The ends of the coils of wire round the They were so B B Fig . 22 . electro - magnet were connected , by means of a ...
Página 56
... turning the handle to the right , however , the spring is lifted by the projection i from the rest k , and the projection makes contact with 7 , whilst t and 7 ' remain unmoved . The spring is not seen in the figure . The circuit is ...
... turning the handle to the right , however , the spring is lifted by the projection i from the rest k , and the projection makes contact with 7 , whilst t and 7 ' remain unmoved . The spring is not seen in the figure . The circuit is ...
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...