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 39
... axes of the coils to the poles of the magnet , so that when one coil was under the north end of the magnet , the other would be under the south end . The commutator in connection with these coils was so constructed that , in turning ...
... axes of the coils to the poles of the magnet , so that when one coil was under the north end of the magnet , the other would be under the south end . The commutator in connection with these coils was so constructed that , in turning ...
Página 43
... the dial- 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.
... the dial- 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.
Página 49
... axis , supported by uprights which were screwed into a small Fig . 21 . block of dry wood . The 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 ...
... axis , supported by uprights which were screwed into a small Fig . 21 . block of dry wood . The 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 ...
Página 52
... axis of a beam supporting two armatures of soft iron , over the poles of two electro - magnets , in the circuits of the two line wires . As the tooth - wheel of the transmitter was turned round , currents were alternately sent through ...
... axis of a beam supporting two armatures of soft iron , over the poles of two electro - magnets , in the circuits of the two line wires . As the tooth - wheel of the transmitter was turned round , currents were alternately sent through ...
Página 55
... coil of fine silk - covered wire , in the middle of which a small magnetic needle plays , having at the end of its axis the pointer seen on the outside face of the instrument . One end of the coil. THE ELECTRIC TELEGRAPH . 55.
... coil of fine silk - covered wire , in the middle of which a small magnetic needle plays , having at the end of its axis the pointer seen on the outside face of the instrument . One end of the coil. THE ELECTRIC TELEGRAPH . 55.
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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...