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 xi
... or four Lines 99. Battery Commutators . 145 · 147 ( c ) Automatic Telegraphs . 100. Morse and Bain's Systems of Automatic Transmission . b 148 § 101. Wheatstone's Systems of Automatic Transmission PAGK 149 102. CONTENTS . xi.
... or four Lines 99. Battery Commutators . 145 · 147 ( c ) Automatic Telegraphs . 100. Morse and Bain's Systems of Automatic Transmission . b 148 § 101. Wheatstone's Systems of Automatic Transmission PAGK 149 102. CONTENTS . xi.
Página 12
... battery of Leyden jars , and re- ceived signals by observing the divergence of suspended pith balls . 17. Cavallo was the next who strove to attain the per- fection of a telegraph by means of frictional electricity . In 1795 he ...
... battery of Leyden jars , and re- ceived signals by observing the divergence of suspended pith balls . 17. Cavallo was the next who strove to attain the per- fection of a telegraph by means of frictional electricity . In 1795 he ...
Página 21
... battery was brought in connection with zero , and the negative with the letter to be transmitted . The connection wires were well insulated , and , at. ABCDEFGHIJKLMNOPQRSTUVWYZ1 2 3 4 5 6 7 8 9 0. THE ELECTRIC TELEGRAPH . 21.
... battery was brought in connection with zero , and the negative with the letter to be transmitted . The connection wires were well insulated , and , at. ABCDEFGHIJKLMNOPQRSTUVWYZ1 2 3 4 5 6 7 8 9 0. THE ELECTRIC TELEGRAPH . 21.
Página 22
... suggested that , for the alarm , it would be possible to employ a pistol by the con- nection of a battery to the pile . In addition to this , he proposed to diminish the number of wires used in Söm- 22 THE ELECTRIC TELEGRAPH .
... suggested that , for the alarm , it would be possible to employ a pistol by the con- nection of a battery to the pile . In addition to this , he proposed to diminish the number of wires used in Söm- 22 THE ELECTRIC TELEGRAPH .
Página 23
... battery would be much more than by the other , and , by varying the time of development of the gas and of the intervals , he proposed to form a code of signals . 26. About the same time that Sömmering invented his telegraph , the same ...
... battery would be much more than by the other , and , by varying the time of development of the gas and of the intervals , he proposed to form a code of signals . 26. About the same time that Sömmering invented his telegraph , the same ...
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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...