The History and Progress of the Electric Telegraph: With Descriptions of Some of the ApparatusD. Van Nostrand, 1869 - 280 páginas |
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... attraction of a certain magnet needle , it would be possible to converse across a space of two or three thousand miles . And I said to him that I would willingly become the purchaser , provided only that might first make a trial of the ...
... attraction of a certain magnet needle , it would be possible to converse across a space of two or three thousand miles . And I said to him that I would willingly become the purchaser , provided only that might first make a trial of the ...
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... attraction produced by friction of bodies was , in some instances , known to the ancients . It was first noticed ... attracting light substances , such as bits of feathers ; and on this account was led to attribute to it a species of ...
... attraction produced by friction of bodies was , in some instances , known to the ancients . It was first noticed ... attracting light substances , such as bits of feathers ; and on this account was led to attribute to it a species of ...
Página 2
... attracted straws and little pieces of sticks in its vicinity . Pliny ( 70 A.D. ) , as well as other naturalists , both Greek and Roman , remarked , at different dates , the same phenomenon , which they regarded , in the spirit of the ...
... attracted straws and little pieces of sticks in its vicinity . Pliny ( 70 A.D. ) , as well as other naturalists , both Greek and Roman , remarked , at different dates , the same phenomenon , which they regarded , in the spirit of the ...
Página 3
... attracted and then repelled . This led him to infer that the electricity which the tube had acquired by friction passed spontaneously to the corks . From the communication of electricity from tubes to corks Grey was led to transmit it ...
... attracted and then repelled . This led him to infer that the electricity which the tube had acquired by friction passed spontaneously to the corks . From the communication of electricity from tubes to corks Grey was led to transmit it ...
Página 4
... attraction of any light substance by an electrified body , it had been observed by Grey that the former was repelled ... attracted by a stick of resin also electrified by friction . It is not a settled question whether it was Symner or ...
... attraction of any light substance by an electrified body , it had been observed by Grey that the former was repelled ... attracted by a stick of resin also electrified by friction . It is not a settled question whether it was Symner or ...
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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...