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 xi
... Polarised , or Induction Relays 80 68. Morse Recorders 69. Embossing Instrument with movable Magnet 70. Direct - working Recorders 83 84 86 71 . " " 99 " " Beaudoin and Digney's 88 99 99 99 99 .72 . 73. Vinay's Ink - recorders 74 ...
... Polarised , or Induction Relays 80 68. Morse Recorders 69. Embossing Instrument with movable Magnet 70. Direct - working Recorders 83 84 86 71 . " " 99 " " Beaudoin and Digney's 88 99 99 99 99 .72 . 73. Vinay's Ink - recorders 74 ...
Página 79
... polarised by contact with one or more permanent magnets . 66. To the first class belongs the common form , known as the American relay , from its general employment on the Ame- rican lines , shown in Fig . 47. The electro - magnet м м ...
... polarised by contact with one or more permanent magnets . 66. To the first class belongs the common form , known as the American relay , from its general employment on the Ame- rican lines , shown in Fig . 47. The electro - magnet м м ...
Página 80
... the middle ones . By altering the places of the plugs , therefore , the coils of the relay may be from go time to time inverted to prevent any lasting effects from. 80 THE ELECTRIC TELEGRAPH . Polarised, or Induction Relays.
... the middle ones . By altering the places of the plugs , therefore , the coils of the relay may be from go time to time inverted to prevent any lasting effects from. 80 THE ELECTRIC TELEGRAPH . Polarised, or Induction Relays.
Página 81
... Polarised or magnetic relays - those belonging to the other class are preferable to the simple electro - magnetic ... polarised relays . The galvanometer relays are very little used , because the contact which they give is uncertain ...
... Polarised or magnetic relays - those belonging to the other class are preferable to the simple electro - magnetic ... polarised relays . The galvanometer relays are very little used , because the contact which they give is uncertain ...
Página 83
... polarised tongue , c , is attracted towards each of them with equal force . When , at the sending station , the key is pressed down , the current passes through the line and relay , which has the effect of magnetising the pole , N , of ...
... polarised tongue , c , is attracted towards each of them with equal force . When , at the sending station , the key is pressed down , the current passes through the line and relay , which has the effect of magnetising the pole , N , of ...
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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...