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 17
... upper . Having prepared a frog in the ordinary manner , on one occasion he remarked that , on hanging it up to an iron balustrade of his house , by a hook of copper wire passed through part of the dorsal column remaining above the junc ...
... upper . Having prepared a frog in the ordinary manner , on one occasion he remarked that , on hanging it up to an iron balustrade of his house , by a hook of copper wire passed through part of the dorsal column remaining above the junc ...
Página 19
... upper plates . 22. This apparatus is known as the voltaic pile . * Its properties are concisely stated as follows : - 1st . It communicates a charge of positive electricity to a condenser in connection with the wire attached to the last ...
... upper plates . 22. This apparatus is known as the voltaic pile . * Its properties are concisely stated as follows : - 1st . It communicates a charge of positive electricity to a condenser in connection with the wire attached to the last ...
Página 20
With Descriptions of Some of the Apparatus Robert Sabine. when the zinc of the upper part is put into contact with the earth , and the condenser with the copper disc at the bottom . These experiments may be repeated ad infinitum even ...
With Descriptions of Some of the Apparatus Robert Sabine. when the zinc of the upper part is put into contact with the earth , and the condenser with the copper disc at the bottom . These experiments may be repeated ad infinitum even ...
Página 24
... upper wire in the annexed figure ( Fig . 8 ) from a towards b , the magnetic a N απ Fig . 8 . · b ' needle N s ... upper wire would from a to b . In the case of the upper wire the observer's head is supposed to be near b , and his feet ...
... upper wire in the annexed figure ( Fig . 8 ) from a towards b , the magnetic a N απ Fig . 8 . · b ' needle N s ... upper wire would from a to b . In the case of the upper wire the observer's head is supposed to be near b , and his feet ...
Página 34
... upper ends of the magnet , so that , on lifting up the bobbin by the handles , a current would be induced in the coil in one direction ; and on lowering it again , a current would traverse the coil in the * In the apparatus constructed ...
... upper ends of the magnet , so that , on lifting up the bobbin by the handles , a current would be induced in the coil in one direction ; and on lowering it again , a current would traverse the coil in the * In the apparatus constructed ...
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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...