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 vi
... magnet needle , it would be possible to converse across a 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 ...
... magnet needle , it would be possible to converse across a 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 ...
Página x
... magnetic Telegraph 31. Sturgeon's Discovery of the Electro - magnet 32. Schilling's Telegraph 33. Faraday's Discoveries . 34. Gauss and Weber's Telegraph . 35. Steinheil's Telegraph 27 28 Morse's Invention of an Electro- 29 33 35 . 99 ...
... magnetic Telegraph 31. Sturgeon's Discovery of the Electro - magnet 32. Schilling's Telegraph 33. Faraday's Discoveries . 34. Gauss and Weber's Telegraph . 35. Steinheil's Telegraph 27 28 Morse's Invention of an Electro- 29 33 35 . 99 ...
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... Magnet 70. Direct - working Recorders 83 84 86 71 . " " 99 " " Beaudoin and Digney's 88 99 99 99 99 .72 . 73. Vinay's Ink - recorders 74. Bréguet's 75. Sortais ' Self - starting Apparatus 76. Siemens ' 77. Translation , or Re ...
... Magnet 70. Direct - working Recorders 83 84 86 71 . " " 99 " " Beaudoin and Digney's 88 99 99 99 99 .72 . 73. Vinay's Ink - recorders 74. Bréguet's 75. Sortais ' Self - starting Apparatus 76. Siemens ' 77. Translation , or Re ...
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... magnet needle , as well as to polarize an unmagnetized one , were known to , and described as early as 1804 , by Professor Izarn , in his " Manuel du Galvanisme . " The paragraph which especially refers to this subject is headed ...
... magnet needle , as well as to polarize an unmagnetized one , were known to , and described as early as 1804 , by Professor Izarn , in his " Manuel du Galvanisme . " The paragraph which especially refers to this subject is headed ...
Página 24
... magnet needle by a voltaic current ) , is due the credit of having made this important discovery . Little was known ... magnetic a N απ Fig . 8 . · b ' needle N s , suspended in its neighbourhood , will be deflected , and take up a ...
... magnet needle by a voltaic current ) , is due the credit of having made this important discovery . Little was known ... magnetic a N απ Fig . 8 . · b ' needle N s , suspended in its neighbourhood , will be deflected , and take up a ...
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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...