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
... Dial . I. ( near the end ) . Latin Translation published at Leyden in 1700 . - TRANSLATION.- " You remind me of one who offered to sell me a secret art , by which , through the attraction of a certain magnet needle , it would be ...
... Dial . I. ( near the end ) . Latin Translation published at Leyden in 1700 . - TRANSLATION.- " You remind me of one who offered to sell me a secret art , by which , through the attraction of a certain magnet needle , it would be ...
Página x
... Dial Telegraph 43 • 46 47 47 48 · 48 49 51 45 . 99 99 " " improved 52 • 46 . 99 99 " 9 with Magneto - electricity 52 § 47. Classification V. TELEGRAPHS NOW IN USE . ( a ) Needle Telegraphs . § 48. Needle Telegraphs introduced into ...
... Dial Telegraph 43 • 46 47 47 48 · 48 49 51 45 . 99 99 " " improved 52 • 46 . 99 99 " 9 with Magneto - electricity 52 § 47. Classification V. TELEGRAPHS NOW IN USE . ( a ) Needle Telegraphs . § 48. Needle Telegraphs introduced into ...
Página xii
... Dial Telegraphs . § 103. Use of Dial Telegraphs 156 • 104. Magneto - electric Pointer Telegraph of Siemens and Halske 156 105. Alarm used with same 161 • 106. Bréguet's Electro - magnetic Dial Instrument 107. Wheatstone's Universal ...
... Dial Telegraphs . § 103. Use of Dial Telegraphs 156 • 104. Magneto - electric Pointer Telegraph of Siemens and Halske 156 105. Alarm used with same 161 • 106. Bréguet's Electro - magnetic Dial Instrument 107. Wheatstone's Universal ...
Página 12
... 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 only at a time could be seen on the revolving dial . The clocks were made to go ...
... 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 only at a time could be seen on the revolving dial . The clocks were made to go ...
Página 13
... dial of the clock . This was accomplished in the following manner . transmitter caused a current of electricity to be constantly operating upon the electrométers , except only when it was required to denote a letter , and then he ...
... dial of the clock . This was accomplished in the following manner . transmitter caused a current of electricity to be constantly operating upon the electrométers , except only when it was required to denote a letter , and then he ...
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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...