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 49
... screw on the longer arm of the lever was pressed upon the front contact , whilst the similar screw in the shorter arm was used only to regulate the play of the key . One pole of the battery was connected to the front con- tact , called ...
... screw on the longer arm of the lever was pressed upon the front contact , whilst the similar screw in the shorter arm was used only to regulate the play of the key . One pole of the battery was connected to the front con- tact , called ...
Página 52
... screw for tightening or loosening it . This spring acted in the contrary direction to the single electro - magnet , but , of course , with inferior force . It had tension enough , however , to separate the armature from the poles , and ...
... screw for tightening or loosening it . This spring acted in the contrary direction to the single electro - magnet , but , of course , with inferior force . It had tension enough , however , to separate the armature from the poles , and ...
Página 53
... 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 revolve ...
... 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 revolve ...
Página 56
... screw L , to which the line wire is attached at the back of the instrument , and the other end with the commutator , by which a battery is put between it and the earth , and its direction reversed accord- ing to the position of the ...
... screw L , to which the line wire is attached at the back of the instrument , and the other end with the commutator , by which a battery is put between it and the earth , and its direction reversed accord- ing to the position of the ...
Página 58
... armature is held upon a flat spring , which dispenses with the axis , bearings , beam , and adjusting screws . The armature strikes upon upper and lower are anvils , one of which is supported upon a piece 58 THE ELECTRIC TELEGRAPH .
... armature is held upon a flat spring , which dispenses with the axis , bearings , beam , and adjusting screws . The armature strikes upon upper and lower are anvils , one of which is supported upon a piece 58 THE ELECTRIC 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...