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 22
... passing through the bottom of the glass reservoir . The lower ends of the thirty - five gold points were soldered to copper wires insulated with silk , passing through the tube E of glass or porcelain to the transmitting station . Here ...
... passing through the bottom of the glass reservoir . The lower ends of the thirty - five gold points were soldered to copper wires insulated with silk , passing through the tube E of glass or porcelain to the transmitting station . Here ...
Página 24
... pass along the upper wire in the annexed figure ( Fig . 8 ) from a towards b , the magnetic a N απ Fig . 8 . · b ' needle N s , suspended in its neighbourhood , will be deflected , and take up a position indicated by the dotted line n s ...
... pass along the upper wire in the annexed figure ( Fig . 8 ) from a towards b , the magnetic a N απ Fig . 8 . · b ' needle N s , suspended in its neighbourhood , will be deflected , and take up a position indicated by the dotted line n s ...
Página 25
... pass , therefore , in both wires at the same time in opposite directions , they act in the same sense on the magnetic needle Ns , and , other things being equal , their combined force is double that of a single wire . The same would be ...
... pass , therefore , in both wires at the same time in opposite directions , they act in the same sense on the magnetic needle Ns , and , other things being equal , their combined force is double that of a single wire . The same would be ...
Página 27
... passing , it acquires magnetism , which lasts only as long as the current continues in the coil . In this way he constructed some powerful magnets . A form which he made , and which ac- quired an immense lifting power , is shown in Fig ...
... passing , it acquires magnetism , which lasts only as long as the current continues in the coil . In this way he constructed some powerful magnets . A form which he made , and which ac- quired an immense lifting power , is shown in Fig ...
Página 30
... passing , but that on inserting the end of a permanent magnet into the middle of a helix of wire , a current of electricity was gene- rated whose direction depended upon the pole inserted and the end of the spiral with regard to the ...
... passing , but that on inserting the end of a permanent magnet into the middle of a helix of wire , a current of electricity was gene- rated whose direction depended upon the pole inserted and the end of the spiral with regard to the ...
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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...