The History and Progress of the Electric Telegraph: With Descriptions of Some of the ApparatusD. Van Nostrand, 1869 - 280 páginas |
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With Descriptions of Some of the Apparatus Robert Sabine. $ B 287 534 IN MEMORIAM George Davidson 1825-1911 UNIVERSITATIS SIGILLVM EX LIBRIS CALI. UC - NRLF Front Cover.
With Descriptions of Some of the Apparatus Robert Sabine. $ B 287 534 IN MEMORIAM George Davidson 1825-1911 UNIVERSITATIS SIGILLVM EX LIBRIS CALI. UC - NRLF Front Cover.
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... 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 isochronously ; and as the dials moved round , the same letter ...
... 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 isochronously ; and as the dials moved round , the same letter ...
Página 49
... front contact , whilst the similar screw in the shorter arm was used only to regulate the play of the key . One pole of the battery was connected to the front con- tact , called the anvil , and the other pole to earth . The line was ...
... front contact , whilst the similar screw in the shorter arm was used only to regulate the play of the key . One pole of the battery was connected to the front con- tact , called the anvil , and the other pole to earth . The line was ...
Página 57
... front of the case are connected with two arbors inside , similar to the one shown in Fig . 23 , each of which commutates the current of a battery through the galvanoscope coils sur- rounding the needle attached to one of the pointers ...
... front of the case are connected with two arbors inside , similar to the one shown in Fig . 23 , each of which commutates the current of a battery through the galvanoscope coils sur- rounding the needle attached to one of the pointers ...
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... contact point 1 , and front part of the lever to 3 , where it enters the line L. Arriving by L ' , the current passes over K , from the middle 3 , to the back contact point 2 , and from this , the 60 THE ELECTRIC TELEGRAPH .
... contact point 1 , and front part of the lever to 3 , where it enters the line L. Arriving by L ' , the current passes over K , from the middle 3 , to the back contact point 2 , and from this , the 60 THE ELECTRIC TELEGRAPH .
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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...