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 56
... remains vertical . The currents arriving by the line pass through L , coils of the indicator , spring ť , metal stop k , spring t , terminal т , to earth ; and the needle is deflected to the right or left , according as the arriving cur ...
... remains vertical . The currents arriving by the line pass through L , coils of the indicator , spring ť , metal stop k , spring t , terminal т , to earth ; and the needle is deflected to the right or left , according as the arriving cur ...
Página 77
... remains an instant in contact with both line and earth at the same time . The advantage which M. Lacoine proposes to gain by the employment of this key is , the discharge of the line between each signal and the replacing of the relay in ...
... remains an instant in contact with both line and earth at the same time . The advantage which M. Lacoine proposes to gain by the employment of this key is , the discharge of the line between each signal and the replacing of the relay in ...
Página 83
... remains on that side after the cessation of the current , attracted by the pole N , whose distance from c is then less than that of N ' . The platinum contact of c remains against D , and closes the local circuit until the key at the ...
... remains on that side after the cessation of the current , attracted by the pole N , whose distance from c is then less than that of N ' . The platinum contact of c remains against D , and closes the local circuit until the key at the ...
Página 89
... remains the same . Fig . 40 represents an elevation of the apparatus , the clock- work being in the interior . The parts turned directly by the clockwork are the roller , R. and the printing - disc , D. The paper strip is drawn from the ...
... remains the same . Fig . 40 represents an elevation of the apparatus , the clock- work being in the interior . The parts turned directly by the clockwork are the roller , R. and the printing - disc , D. The paper strip is drawn from the ...
Página 102
... remains passive , through contact , 2 , to coils 2 No I Earth No 2 W2 S M w wwww WI MI GI KI 3 S R R2 R2 RI 21 W4 w'4 พ 3 w'3 Fig . 49 . of Morse H , on the left , earth , & c . Each movement of the beam of the latter closes the circuit ...
... remains passive , through contact , 2 , to coils 2 No I Earth No 2 W2 S M w wwww WI MI GI KI 3 S R R2 R2 RI 21 W4 w'4 พ 3 w'3 Fig . 49 . of Morse H , on the left , earth , & c . Each movement of the beam of the latter closes the circuit ...
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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...