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 6
... connected by a conductor with the earth , decomposes it , and repels the positive ele- ment , attracting and retaining the negative element on the outer coating . If the communication between the knob and Fig . 1 . the source of ...
... connected by a conductor with the earth , decomposes it , and repels the positive ele- ment , attracting and retaining the negative element on the outer coating . If the communication between the knob and Fig . 1 . the source of ...
Página 7
With Descriptions of Some of the Apparatus Robert Sabine. connected to earth through the body of the experimenter , and the other end held by a person who grasped an iron rod . The moment the latter dipped the rod into the river , both ...
With Descriptions of Some of the Apparatus Robert Sabine. connected to earth through the body of the experimenter , and the other end held by a person who grasped an iron rod . The moment the latter dipped the rod into the river , both ...
Página 10
... connected at the further end to a separate pith - ball electroscope , and corresponded with one of the letters of the alphabet . In this way any letter could be indicated by bringing to the end of the wire a source of static electricity ...
... connected at the further end to a separate pith - ball electroscope , and corresponded with one of the letters of the alphabet . In this way any letter could be indicated by bringing to the end of the wire a source of static electricity ...
Página 11
... connects with a similar cylinder and electrometer in a distant apartment ; and his wife , by remarking the cor- responding motions of the ball , writes down the words they indicate , from which it appears that he has formed an alphabet ...
... connects with a similar cylinder and electrometer in a distant apartment ; and his wife , by remarking the cor- responding motions of the ball , writes down the words they indicate , from which it appears that he has formed an alphabet ...
Página 19
... connected wires to the lower and 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 ...
... connected wires to the lower and 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 ...
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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...