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 iv
... space at his command , to give a short and truthful sketch of the origin , rise , and progress of an art grown to an importance sufficient in itself to immortalise its century . Where individual claims to a part of this immortality ...
... space at his command , to give a short and truthful sketch of the origin , rise , and progress of an art grown to an importance sufficient in itself to immortalise its century . Where individual claims to a part of this immortality ...
Página vi
... 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 art , and that it would be sufficient for the purpose if I were to place my- self ...
... 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 art , and that it would be sufficient for the purpose if I were to place my- self ...
Página 11
... spaces cut out of parallel strips of tinfoi pasted on square plates of glass . Such letters are shown in Fig . 3. An electric discharge from the interior coating of a Fig . 3 . ― con- Leyden jar being sent , for instance , through the ...
... spaces cut out of parallel strips of tinfoi pasted on square plates of glass . Such letters are shown in Fig . 3. An electric discharge from the interior coating of a Fig . 3 . ― con- Leyden jar being sent , for instance , through the ...
Página 12
... space of twenty - seven miles , beween Madrid and Aranjuez . He employed a battery of Leyden jars , and re- ceived signals by observing the divergence of suspended pith balls . 17. Cavallo was the next who strove to attain the per ...
... space of twenty - seven miles , beween Madrid and Aranjuez . He employed a battery of Leyden jars , and re- ceived signals by observing the divergence of suspended pith balls . 17. Cavallo was the next who strove to attain the per ...
Página 31
... space will not allow us to enter into the details of the celebrated case , " Jackson v . Morse , " but we may , nevertheless , state con- cisely the impression left upon our minds after the perusal of the evidence pro and con . , which ...
... space will not allow us to enter into the details of the celebrated case , " Jackson v . Morse , " but we may , nevertheless , state con- cisely the impression left upon our minds after the perusal of the evidence pro and con . , which ...
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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...