The History and Progress of the Electric Telegraph: With Descriptions of Some of the ApparatusD. Van Nostrand, 1869 - 280 страници |
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Страница 15
... tongue , he found that , so long as the metals did not make contact with each other , he felt nothing ; but that when the edges were brought together over the tip of his tongue , the moment contact took place , and during the time it ...
... tongue , he found that , so long as the metals did not make contact with each other , he felt nothing ; but that when the edges were brought together over the tip of his tongue , the moment contact took place , and during the time it ...
Страница 18
... tongue be applied to the conductor of an electric machine which is being turned , an acid or alkaline taste " Cosmos , " Einleitende Betrachtungen . will be perceived according as the conductor is being charged 18 THE ELECTRIC TELEGRAPH ...
... tongue be applied to the conductor of an electric machine which is being turned , an acid or alkaline taste " Cosmos , " Einleitende Betrachtungen . will be perceived according as the conductor is being charged 18 THE ELECTRIC TELEGRAPH ...
Страница 50
... 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 used by Wheatstone in conjunction with his alarm , one being acted upon by positive currents ...
... 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 used by Wheatstone in conjunction with his alarm , one being acted upon by positive currents ...
Страница 61
... tongue or armature are inserted the coils of the Morse м and the local battery L B. When in repose the levers of both keys are on the con- tacts 2 , and the line , therefore , at both ends to earth through the coils of the relays . On ...
... tongue or armature are inserted the coils of the Morse м and the local battery L B. When in repose the levers of both keys are on the con- tacts 2 , and the line , therefore , at both ends to earth through the coils of the relays . On ...
Страница 76
... tongue of the relay at the Amsterdam station will be deflected against the contact - point and close Line K 5 S Apparatus . Barth Fig . 33 . The the local circuit , working the recording instrument . negative current will take the same ...
... tongue of the relay at the Amsterdam station will be deflected against the contact - point and close Line K 5 S Apparatus . Barth Fig . 33 . The the local circuit , working the recording instrument . negative current will take the same ...
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Често срещани думи и фрази
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
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Страница 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.
Страница 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...