The History and Progress of the Electric Telegraph: With Descriptions of Some of the ApparatusD. Van Nostrand, 1869 - 280 páginas |
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Página 31
... circuit at any point ; 2nd , by the perforation of paper , if interposed between the disconnected wires ( ! ) ; and 3rd , by the decomposition of saline compounds , to produce colours upon the paper . So far we see neither reason nor ...
... circuit at any point ; 2nd , by the perforation of paper , if interposed between the disconnected wires ( ! ) ; and 3rd , by the decomposition of saline compounds , to produce colours upon the paper . So far we see neither reason nor ...
Página 36
... circuit ; if the metal bars , e and f , be pressed upon the ends , a b and c d respectively , the current will pass in the direc- tion Baeb Rd ƒ c B. But if the bars , e and ƒ , be removed from these positions and placed at right angles ...
... circuit ; if the metal bars , e and f , be pressed upon the ends , a b and c d respectively , the current will pass in the direc- tion Baeb Rd ƒ c B. But if the bars , e and ƒ , be removed from these positions and placed at right angles ...
Página 39
... circuit , the others being cut off . Steinheil was careful to admit his currents for the shortest possible space of time , and for this purpose allowed the contact springs of his commutator to make contact with the lines only at the ...
... circuit , the others being cut off . Steinheil was careful to admit his currents for the shortest possible space of time , and for this purpose allowed the contact springs of his commutator to make contact with the lines only at the ...
Página 42
... circuits other than the earth for voltaic currents would never have been used ; for , in all the earlier experi- ments and attempts with frictional electricity , the earth was used as the return circuit . Steinheil took advantage of his ...
... circuits other than the earth for voltaic currents would never have been used ; for , in all the earlier experi- ments and attempts with frictional electricity , the earth was used as the return circuit . Steinheil took advantage of his ...
Página 44
... and continued to one of the five line wires ; the other ends were joined together and attached to the line used for a return circuit . The manipulator or key , Fig . 19 , consisted 44 THE ELECTRIC TELEGRAPH . Wheatstone's Dial Telegraph.
... and continued to one of the five line wires ; the other ends were joined together and attached to the line used for a return circuit . The manipulator or key , Fig . 19 , consisted 44 THE ELECTRIC TELEGRAPH . Wheatstone's Dial Telegraph.
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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...