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 28
... released by the deflection of a magnet . Schilling executed models of his apparatus , which were exhibited before the Emperor Alexander , and still later before Nicholas . He , however , unhappily died before carrying out his invention ...
... released by the deflection of a magnet . Schilling executed models of his apparatus , which were exhibited before the Emperor Alexander , and still later before Nicholas . He , however , unhappily died before carrying out his invention ...
Página 46
... released a wound - up mechanism . This alarm arrangement is given in Fig . 20. The tooth- 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 ...
... released a wound - up mechanism . This alarm arrangement is given in Fig . 20. The tooth- 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 ...
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 74
... about half a second . The purpose of this is that the armature may be attracted suddenly to the poles of the electro - magnet when a signal is MORSE given , but that on being released the beam. 74 THE ELECTRIC TELEGRAPH .
... about half a second . The purpose of this is that the armature may be attracted suddenly to the poles of the electro - magnet when a signal is MORSE given , but that on being released the beam. 74 THE ELECTRIC TELEGRAPH .
Página 75
... released the beam shall take some time to return to its position of rest , and that during the greater part of this time the spring , f , shall remain in contact with the screw , w , in connection with the reverse battery . SWITCH wif u ...
... released the beam shall take some time to return to its position of rest , and that during the greater part of this time the spring , f , shall remain in contact with the screw , w , in connection with the reverse battery . SWITCH wif u ...
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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...