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 30
... inserting the end of a permanent magnet into the middle of a helix of wire , a current of electricity was gene- rated whose direction depended upon the pole inserted and the end of the spiral with regard to the direction of its windings ...
... inserting the end of a permanent magnet into the middle of a helix of wire , a current of electricity was gene- rated whose direction depended upon the pole inserted and the end of the spiral with regard to the direction of its windings ...
Página 50
... inserted between all the tongues or needles of the relays and the metallic cylinder , so that when the needle of either of the relays was deflected , the current of the local battery passed through the chemi- cally - prepared cloth to ...
... inserted between all the tongues or needles of the relays and the metallic cylinder , so that when the needle of either of the relays was deflected , the current of the local battery passed through the chemi- cally - prepared cloth to ...
Página 51
... was always opposite to a space . These springs were connected to two line wires , and a battery was inserted between the tooth - wheel and earth . From the circumference of the wheel protruded thirty spokes , and THE ELECTRIC TELEGRAPH .
... was always opposite to a space . These springs were connected to two line wires , and a battery was inserted between the tooth - wheel and earth . From the circumference of the wheel protruded thirty spokes , and THE ELECTRIC TELEGRAPH .
Página 60
... inserted the coils of the electro - magnet м , whose armature is em- ployed to mark the paper and record the signals given from the distant station . On pressing down the key K , for L Line Earth M ' K ' TTTT -0000000 Barth Fig . 25 ...
... inserted the coils of the electro - magnet м , whose armature is em- ployed to mark the paper and record the signals given from the distant station . On pressing down the key K , for L Line Earth M ' K ' TTTT -0000000 Barth Fig . 25 ...
Página 61
... inserted the coils of the Morse м and the local battery L B. When in repose the levers of both keys are on the con- tacts 2 , and the line , therefore , at both ends to earth through the coils of the relays . On pressing down either of ...
... inserted the coils of the Morse м and the local battery L B. When in repose the levers of both keys are on the con- tacts 2 , and the line , therefore , at both ends to earth through the coils of the relays . On pressing down either of ...
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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...