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 vi
... into Egypt or Muscovy for the purpose of trying the experiment , but that if he chose to go there himself I would remain in Venice and attend to the rest . " Things are little changed in this regard since Galileo's days vi PREFACE .
... into Egypt or Muscovy for the purpose of trying the experiment , but that if he chose to go there himself I would remain in Venice and attend to the rest . " Things are little changed in this regard since Galileo's days vi PREFACE .
Página ix
... Experiments in Transmission . · II . TELEGRAPHS BY FRICTIONAL ELECTRICITY . 11. Letter of " C. M. " 12. Lesage's.Telegraph 13. Pith - ball Electroscopes 14. Lomond's Telegraph 15. Reusser's Telégraph 16. Don Silva's and Betancourt's ...
... Experiments in Transmission . · II . TELEGRAPHS BY FRICTIONAL ELECTRICITY . 11. Letter of " C. M. " 12. Lesage's.Telegraph 13. Pith - ball Electroscopes 14. Lomond's Telegraph 15. Reusser's Telégraph 16. Don Silva's and Betancourt's ...
Página xiii
... Experiments 167. Theory of Thunder - storms 168. Steinheil's Lightning Discharger 169. Meissner's Plate 258 259 • 263 265 99 170. Siemens ' " " " " . 266 PAGE § 171. Bréguet's Plate Discharger 172. Fardley's " " CONTENTS . xiii.
... Experiments 167. Theory of Thunder - storms 168. Steinheil's Lightning Discharger 169. Meissner's Plate 258 259 • 263 265 99 170. Siemens ' " " " " . 266 PAGE § 171. Bréguet's Plate Discharger 172. Fardley's " " CONTENTS . xiii.
Página 1
... experiments with frictional electricity . The third period dates from the discovery of galvanic electricity to the present time . 2. The phenomenon of electrical attraction produced by friction of bodies was , in some instances , known ...
... experiments with frictional electricity . The third period dates from the discovery of galvanic electricity to the present time . 2. The phenomenon of electrical attraction produced by friction of bodies was , in some instances , known ...
Página 2
... experimental investigations , partly perhaps because the conservative spirit of the times discouraged such inquiries ... experiment 2 THE ELECTRIC TELEGRAPH . Early systematic Inquiries.
... experimental investigations , partly perhaps because the conservative spirit of the times discouraged such inquiries ... experiment 2 THE ELECTRIC TELEGRAPH . Early systematic Inquiries.
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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...