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 47
... sending station were a small battery , K , and a key , s , consisting of two metallic springs , a b , of which the lower one , b , was fixed on a block of wood , and insulated from the other by a strip of ivory . The spring , a , could ...
... sending station were a small battery , K , and a key , s , consisting of two metallic springs , a b , of which the lower one , b , was fixed on a block of wood , and insulated from the other by a strip of ivory . The spring , a , could ...
Página 48
... sending station , and of an electro - magnet whose wire coils are in the line circuit at the receiving station . Over the poles of this electro - magnet a soft iron armature is held on one end of a lever , on whose other end a pencil or ...
... sending station , and of an electro - magnet whose wire coils are in the line circuit at the receiving station . Over the poles of this electro - magnet a soft iron armature is held on one end of a lever , on whose other end a pencil or ...
Página 50
... sending station , Davy was enabled , by reversing the currents , to deflect at pleasure the tongues or needles of six relays at the receiving station . This was done by putting in each line two relays , similar in construction to those ...
... sending station , Davy was enabled , by reversing the currents , to deflect at pleasure the tongues or needles of six relays at the receiving station . This was done by putting in each line two relays , similar in construction to those ...
Página 51
... sending station imparted to the cylinder a the receiving station a rotatory motion resembling that of the long hand of a clock governed by the pendulum and escapement . The cloth used for receiving the marks was impregnated with iodide ...
... sending station imparted to the cylinder a the receiving station a rotatory motion resembling that of the long hand of a clock governed by the pendulum and escapement . The cloth used for receiving the marks was impregnated with iodide ...
Página 52
... sending commutator , and one of the electro - magnets of the indicator . This was a material step in the right direction , and fulfilled the first condition of a successful telegraph - that of requiring only a single line wire . In the ...
... sending commutator , and one of the electro - magnets of the indicator . This was a material step in the right direction , and fulfilled the first condition of a successful telegraph - that of requiring only a single line wire . In the ...
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...