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 46
... wheel n was arrested by the end of the lever p . On the Fig . 20 . other end of p was a soft iron armature , v , which , when a current passed through the coil , u , of the electro - magnet , was attracted , and released the wheel . The ...
... wheel n was arrested by the end of the lever p . On the Fig . 20 . other end of p was a soft iron armature , v , which , when a current passed through the coil , u , of the electro - magnet , was attracted , and released the wheel . The ...
Página 47
With Descriptions of Some of the Apparatus Robert Sabine. attracted , and released the wheel . The case contained a clock- work , and was surmounted by a bell , which was struck by a hammer , moved backwards and forwards by means of an ...
With Descriptions of Some of the Apparatus Robert Sabine. attracted , and released the wheel . The case contained a clock- work , and was surmounted by a bell , which was struck by a hammer , moved backwards and forwards by means of an ...
Página 51
... wheel , supported by a metal upright . The teeth of this wheel , to the number of fifteen , were so arranged that the teeth and the spaces in rotation represented thirty letters of the alphabet , numerals , & c . On each side of the wheel ...
... wheel , supported by a metal upright . The teeth of this wheel , to the number of fifteen , were so arranged that the teeth and the spaces in rotation represented thirty letters of the alphabet , numerals , & c . On each side of the wheel ...
Página 52
... wheel , and it was wished to signal the letter opposite the spoke taken hold of . The receiving instrument or ... wheel of the transmitter was turned round , currents were alternately sent through the side contacts , through the lines ...
... wheel , and it was wished to signal the letter opposite the spoke taken hold of . The receiving instrument or ... wheel of the transmitter was turned round , currents were alternately sent through the side contacts , through the lines ...
Página 53
... 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 revolve half as many times as there were letters , numerals , & c . , engraved on the ...
... 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 revolve half as many times as there were letters , numerals , & c . , engraved on the ...
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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...