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 ix
... positive ” and “ negative 8. Discovery of the Leyden Jar 9. Watson's Leyden Jar 10. Experiments in Transmission . · II . TELEGRAPHS BY FRICTIONAL ELECTRICITY . 11. Letter of " C. M. " 12. Lesage's.Telegraph 13. Pith - ball Electroscopes ...
... positive ” and “ negative 8. Discovery of the Leyden Jar 9. Watson's Leyden Jar 10. Experiments in Transmission . · II . TELEGRAPHS BY FRICTIONAL ELECTRICITY . 11. Letter of " C. M. " 12. Lesage's.Telegraph 13. Pith - ball Electroscopes ...
Página 4
... positive electricity to that which Dufay had called vitreous , and negative to that called resinous . Dufay , without the remotest idea of the transmission of signals for practical purposes , and with the pure curiosity of * Phil ...
... positive electricity to that which Dufay had called vitreous , and negative to that called resinous . Dufay , without the remotest idea of the transmission of signals for practical purposes , and with the pure curiosity of * Phil ...
Página 6
... positive electricity , the charge acts upon the natural electricity of the outer coating , which , during the operation , should be connected by a conductor with the earth , decomposes it , and repels the positive ele- ment , attracting ...
... positive electricity , the charge acts upon the natural electricity of the outer coating , which , during the operation , should be connected by a conductor with the earth , decomposes it , and repels the positive ele- ment , attracting ...
Página 7
... Magazine , vol . xv . , p . 73. The page is headed , “ An expe- ditious method of conveying intelligence . " wire , from one place to another , without being THE ELECTRIC TELEGRAPH . 7 Franklin's Theory Terms “positive” and “negative.
... Magazine , vol . xv . , p . 73. The page is headed , “ An expe- ditious method of conveying intelligence . " wire , from one place to another , without being THE ELECTRIC TELEGRAPH . 7 Franklin's Theory Terms “positive” and “negative.
Página 19
... positive or negative electricity . The similarity of these results with those obtained by Sulzer was an analogy advanced by Volta in support of his contact theory . Another theory , and that now very generally accepted , was first ...
... positive or negative electricity . The similarity of these results with those obtained by Sulzer was an analogy advanced by Volta in support of his contact theory . Another theory , and that now very generally accepted , was first ...
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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...