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 5
... surface of a glass jar , b b an inner coating of the same material , and c a knob attached to a wire in connection with the inner coating . On charging the knob and inner THE ELECTRIC TELEGRAPH . 5 Discovery of the Transmission of ...
... surface of a glass jar , b b an inner coating of the same material , and c a knob attached to a wire in connection with the inner coating . On charging the knob and inner THE ELECTRIC TELEGRAPH . 5 Discovery of the Transmission of ...
Página 49
... surfaces of the hammer and anvil of the contact were faced with platinum , in order to prevent oxidation by dampness from the atmosphere , or by being burnt by the action of the current . D 43. In 1838 Edward Davy obtained a patent for ...
... surfaces of the hammer and anvil of the contact were faced with platinum , in order to prevent oxidation by dampness from the atmosphere , or by being burnt by the action of the current . D 43. In 1838 Edward Davy obtained a patent for ...
Página 51
... surface of the cloth into regular squares , which facilitated reading off messages . 44. The system which we have next to notice is another invention of our ingenious countryman , Professor Wheat- stone : this is his first dial ...
... surface of the cloth into regular squares , which facilitated reading off messages . 44. The system which we have next to notice is another invention of our ingenious countryman , Professor Wheat- stone : this is his first dial ...
Página 68
... surface , the interior coating being formed by the metal conductor , the dielectric by the gutta - percha or other insulator , and the outer coating by the metallic covering , or by the dampness occasioned by contact with the earth ...
... surface , the interior coating being formed by the metal conductor , the dielectric by the gutta - percha or other insulator , and the outer coating by the metallic covering , or by the dampness occasioned by contact with the earth ...
Página 77
... surface , A A , level . These metal pieces are shown black in the figure , and the ivory white . From a binding screw , c , attached to the plate в B , and therefore in electrical connection with each of the metallic rectangles , a wire ...
... surface , A A , level . These metal pieces are shown black in the figure , and the ivory white . From a binding screw , c , attached to the plate в B , and therefore in electrical connection with each of the metallic rectangles , a wire ...
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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...