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 8
... placed at right angles with the extremities of the wires , and about one inch below them . Also let the wires be fixed in a solid piece of glass , at six inches from the end ; and let that part of them which reaches from the glass to ...
... placed at right angles with the extremities of the wires , and about one inch below them . Also let the wires be fixed in a solid piece of glass , at six inches from the end ; and let that part of them which reaches from the glass to ...
Página 12
... placed two clocks at two stations ; these two clocks had upon the second - hand arbour a dial with twenty letters on it ; a screen was placed in front of each of these dials , and an orifice was cut in each screen , so that one letter ...
... placed two clocks at two stations ; these two clocks had upon the second - hand arbour a dial with twenty letters on it ; a screen was placed in front of each of these dials , and an orifice was cut in each screen , so that one letter ...
Página 28
... placed in a vertical position within coils of wire . According to other accounts , he employed only one magnetic needle and mul- tiplier , with two leading wires , as proposed by Fechner , and was enabled by means of a combination of ...
... placed in a vertical position within coils of wire . According to other accounts , he employed only one magnetic needle and mul- tiplier , with two leading wires , as proposed by Fechner , and was enabled by means of a combination of ...
Página 31
... placed in our hands by Professor Morse . A conversation appears to have been started amongst the passengers on board the S.S. Sully , upon the subject of elec- tricity and Franklin's experiment of transmission of it along a suspended ...
... placed in our hands by Professor Morse . A conversation appears to have been started amongst the passengers on board the S.S. Sully , upon the subject of elec- tricity and Franklin's experiment of transmission of it along a suspended ...
Página 35
... was called the inductor .グル ገ R Fig.13 . The receiving instrument placed at the distant station is represented in Fig . 13. It consists of a large THE ELECTRIC TELEGRAPH . 35 Steinheil's Telegraph Morse's Invention of an Electro- 99.
... was called the inductor .グル ገ R Fig.13 . The receiving instrument placed at the distant station is represented in Fig . 13. It consists of a large THE ELECTRIC TELEGRAPH . 35 Steinheil's Telegraph Morse's Invention of an Electro- 99.
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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...