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 v
... forces of magnets was not in itself suffi- cient to suggest to an imaginative mind its application to the communication of intelligible signals . It is also no less difficult to conclude that an employment of frictional electricity to ...
... forces of magnets was not in itself suffi- cient to suggest to an imaginative mind its application to the communication of intelligible signals . It is also no less difficult to conclude that an employment of frictional electricity to ...
Página 10
... force . This could , and perhaps was , effected by Lesage suddenly , by discharging his line as soon as he had given a signal ; in other words , by letting the line and pith balls reassume a state of electrical equilibrium . 14. Lomond ...
... force . This could , and perhaps was , effected by Lesage suddenly , by discharging his line as soon as he had given a signal ; in other words , by letting the line and pith balls reassume a state of electrical equilibrium . 14. Lomond ...
Página 25
... force is double that of a single wire . The same would be reached by joining b and b ' by a wire , and letting a current of equal strength pass from a to b , b ' , and a ' . 28. Professor Schweigger , of Halle , the same who sug- gested ...
... force is double that of a single wire . The same would be reached by joining b and b ' by a wire , and letting a current of equal strength pass from a to b , b ' , and a ' . 28. Professor Schweigger , of Halle , the same who sug- gested ...
Página 40
... not , for example , be large , because their inertia would have been too great ; nor too small , because their mechanical force would not have been. 40 THE ELECTRIC TELEGRAPH . Fallacies about the Invention of the "Electric Telegraph.
... not , for example , be large , because their inertia would have been too great ; nor too small , because their mechanical force would not have been. 40 THE ELECTRIC TELEGRAPH . Fallacies about the Invention of the "Electric Telegraph.
Página 41
With Descriptions of Some of the Apparatus Robert Sabine. small , because their mechanical force would not have been great enough to have effected the printing . Two small per- manent magnets in the rear of the printing needles retarded ...
With Descriptions of Some of the Apparatus Robert Sabine. small , because their mechanical force would not have been great enough to have effected the printing . Two small per- manent magnets in the rear of the printing needles retarded ...
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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...