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 28
... clockwork , which was released by the deflection of a magnet . Schilling executed models of his apparatus , which were exhibited before the Emperor Alexander , and still later before Nicholas . He , however , unhappily died before ...
... clockwork , which was released by the deflection of a magnet . Schilling executed models of his apparatus , which were exhibited before the Emperor Alexander , and still later before Nicholas . He , however , unhappily died before ...
Página 40
... clockwork , which , whenever a mark was made , moved the paper onwards , leaving a blank space before the next signal . These signals were necessarily only dots , because induction currents are only of momentary duration . Much nicety ...
... clockwork , which , whenever a mark was made , moved the paper onwards , leaving a blank space before the next signal . These signals were necessarily only dots , because induction currents are only of momentary duration . Much nicety ...
Página 50
... clockwork in the construction of a receiving instrument . Davy's telegraph required at least four line wires , which , independently of its complication , would be reason enough to account for the fact that it never came into practice ...
... clockwork in the construction of a receiving instrument . Davy's telegraph required at least four line wires , which , independently of its complication , would be reason enough to account for the fact that it never came into practice ...
Página 52
... clockwork , the escapement of which was fixed in the axis of a beam supporting two armatures of soft iron , over the poles of two electro - magnets , in the circuits of the two line wires . As the tooth - wheel of the transmitter was ...
... clockwork , the escapement of which was fixed in the axis of a beam supporting two armatures of soft iron , over the poles of two electro - magnets , in the circuits of the two line wires . As the tooth - wheel of the transmitter was ...
Página 84
... clockwork for drawing this strip of paper with a uniform velocity over the marking - point . The original apparatus was all constructed simply and strongly . The paper was marked by the point of a style carried on the end of the beam ...
... clockwork for drawing this strip of paper with a uniform velocity over the marking - point . The original apparatus was all constructed simply and strongly . The paper was marked by the point of a style carried on the end of the beam ...
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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...