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 7
... held by a person who grasped an iron rod . The moment the latter dipped the rod into the river , both felt a shock . Subsequently , in the same year , Watson transmitted an electric discharge through 2,800 feet of wire , and the same ...
... held by a person who grasped an iron rod . The moment the latter dipped the rod into the river , both felt a shock . Subsequently , in the same year , Watson transmitted an electric discharge through 2,800 feet of wire , and the same ...
Página 16
... held in his hand , when , having touched one of the nerves with his scalpel , he felt a shock resembling that produced by electricity . * In 1790 Madame Galvani , wife of the professor of anatomy at Bologna , being attacked with a ...
... held in his hand , when , having touched one of the nerves with his scalpel , he felt a shock resembling that produced by electricity . * In 1790 Madame Galvani , wife of the professor of anatomy at Bologna , being attacked with a ...
Página 18
... held tenaciously to the doctrines of their master , and a scientific war of opinions ensued between the schools of Pavia and Bologna , out of which Volta came victorious even before he had completely verified his sagacious conjectures ...
... held tenaciously to the doctrines of their master , and a scientific war of opinions ensued between the schools of Pavia and Bologna , out of which Volta came victorious even before he had completely verified his sagacious conjectures ...
Página 40
... held back ; and on the current being changed , the reverse took place the other needle only being de- flected . Thus the signals on the paper were recorded in two lines those to the right marking the deflections in that direction , and ...
... held back ; and on the current being changed , the reverse took place the other needle only being de- flected . Thus the signals on the paper were recorded in two lines those to the right marking the deflections in that direction , and ...
Página 48
... held on one end of a lever , on whose other end a pencil or style is carried , which either marks a zigzag line or presses into a strip of paper pulled with a uniform velocity over it . 42. Morse's telegraph underwent in a few years ...
... held on one end of a lever , on whose other end a pencil or style is carried , which either marks a zigzag line or presses into a strip of paper pulled with a uniform velocity over it . 42. Morse's telegraph underwent in a few years ...
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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...