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 v
... attach to the employment of magnets for transmitting intelligence to a distance , but failed to see his way to the attainment of that object . In one of his dialogues on the two great rival astronomical systems , written in 1632 , he ...
... attach to the employment of magnets for transmitting intelligence to a distance , but failed to see his way to the attainment of that object . In one of his dialogues on the two great rival astronomical systems , written in 1632 , he ...
Página 5
... material , and c a knob attached to a wire in connection with the inner coating . On charging the knob and inner THE ELECTRIC TELEGRAPH . 5 Discovery of the Transmission of Electricity 2344556 Terms" Electrics" and "Non-electrics"
... material , and c a knob attached to a wire in connection with the inner coating . On charging the knob and inner THE ELECTRIC TELEGRAPH . 5 Discovery of the Transmission of Electricity 2344556 Terms" Electrics" and "Non-electrics"
Página 19
... attached to the last zinc disc , when the last copper disc is connected with the earth . 2nd . It communicates a charge of negative electricity to the condenser when the poles are reversed , that is to say , * The more recent forms ...
... attached to the last zinc disc , when the last copper disc is connected with the earth . 2nd . It communicates a charge of negative electricity to the condenser when the poles are reversed , that is to say , * The more recent forms ...
Página 39
... attached travelled in the white annular spaces , and made contact only at a and b , whilst in every other position the circuit was interrupted . The receiving apparatus consisted of an oblong coil of wire or mul- tiplier of 600 turns ...
... attached travelled in the white annular spaces , and made contact only at a and b , whilst in every other position the circuit was interrupted . The receiving apparatus consisted of an oblong coil of wire or mul- tiplier of 600 turns ...
Página 43
... - plate , with pointers attached to the axes of the magnet- needles , broken away in the middle , to show the multipliers . Each pointer was deflected from its position of rest always THE ELECTRIC TELEGRAPH . 43 Davy's Telegraph.
... - plate , with pointers attached to the axes of the magnet- needles , broken away in the middle , to show the multipliers . Each pointer was deflected from its position of rest always THE ELECTRIC TELEGRAPH . 43 Davy's 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...