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 20
... was led to a metal terminal at the transmitting station . ' Galvanism , " by Sir W. S. Harris , p . 35 . To send a signal it was only necessary to bring 20 THE ELECTRIC TELEGRAPH . Discovery of the Decomposition of Water by the Pile.
... was led to a metal terminal at the transmitting station . ' Galvanism , " by Sir W. S. Harris , p . 35 . To send a signal it was only necessary to bring 20 THE ELECTRIC TELEGRAPH . Discovery of the Decomposition of Water by the Pile.
Página 21
... terminals in question . The current passing from one terminal traversed its line wire to the voltameter at the receiving station , where it passed between the gold points corresponding to the terminals touched by the poles , and ...
... terminals in question . The current passing from one terminal traversed its line wire to the voltameter at the receiving station , where it passed between the gold points corresponding to the terminals touched by the poles , and ...
Página 22
... terminals at one end , and from the voltameters at the other , were bound up in the form of a cable . Sömmering proposed to call the attention of the receiving station by liberating an alarm by means of accumulated gas . Fig . 7 , a ...
... terminals at one end , and from the voltameters at the other , were bound up in the form of a cable . Sömmering proposed to call the attention of the receiving station by liberating an alarm by means of accumulated gas . Fig . 7 , a ...
Página 53
... terminal screws e and f . On the top of the shaft was a pinion D , locking into the tooth - wheel w . The number of teeth of the wheel w were in relation to those of the pinion D , so that one complete revolution of w would cause D to ...
... terminal screws e and f . On the top of the shaft was a pinion D , locking into the tooth - wheel w . The number of teeth of the wheel w were in relation to those of the pinion D , so that one complete revolution of w would cause D to ...
Página 56
... terminal T , earth , and from the + pole of the battery , terminal P , spring s ' , part b of arbor , arm i , spring t ' , multiplier , terminal L , line , opposite station apparatus , and earth . - - The opposite springs are lifted and ...
... terminal T , earth , and from the + pole of the battery , terminal P , spring s ' , part b of arbor , arm i , spring t ' , multiplier , terminal L , line , opposite station apparatus , and earth . - - The opposite springs are lifted and ...
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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...