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 25
... magnetic needle , and found that the deflecting force increased with the number of turns . Such an apparatus , called an electro - magnetic multiplier , is shown in Fig . 9 . It has since become one of the most essential instruments for ...
... magnetic needle , and found that the deflecting force increased with the number of turns . Such an apparatus , called an electro - magnetic multiplier , is shown in Fig . 9 . It has since become one of the most essential instruments for ...
Página 26
... magnetic needles and line wires as there are letters of the alphabet , and with the help of a voltaic battery whose ... magnet needle , the deflections of which , to the right or left hand , were to supply the elementary signals for the ...
... magnetic needles and line wires as there are letters of the alphabet , and with the help of a voltaic battery whose ... magnet needle , the deflections of which , to the right or left hand , were to supply the elementary signals for the ...
Página 27
... magnetic needles with coils of wire ; each needle being furnished with a small screen , so that when it was unaffected by a ... magnet so arranged became a north pole and the other a south pole if the spiral wire were wound in the same ...
... magnetic needles with coils of wire ; each needle being furnished with a small screen , so that when it was unaffected by a ... magnet so arranged became a north pole and the other a south pole if the spiral wire were wound in the same ...
Página 28
... magnets , the wire has to be wound several times round each of the horns . This is generally done by means of bobbins ... magnet . Schilling executed models of his apparatus , which were exhibited before the Emperor Alexander , and still ...
... magnets , the wire has to be wound several times round each of the horns . This is generally done by means of bobbins ... magnet . Schilling executed models of his apparatus , which were exhibited before the Emperor Alexander , and still ...
Página 29
... magnets , of Arago's extraordinary experiments , and perhaps a few others . Still it appeared unlikely that these ... magnetic phenomena , and also to discover a new state which may probably have great in- fluence in some of the most ...
... magnets , of Arago's extraordinary experiments , and perhaps a few others . Still it appeared unlikely that these ... magnetic phenomena , and also to discover a new state which may probably have great in- fluence in some of the most ...
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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...