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 2
... cylinder of amber with a piece of flannel . On approaching the cylinder with his finger he obtained , for the first time , the spark , and noticed the noise which always accompanies it . Boyle - who observed that warmth increased the ...
... cylinder of amber with a piece of flannel . On approaching the cylinder with his finger he obtained , for the first time , the spark , and noticed the noise which always accompanies it . Boyle - who observed that warmth increased the ...
Página 11
... 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 of motions . As the ...
... 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 of motions . As the ...
Página 50
... 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 the metallic cylinder , producing a dot . On the arrival of a current the ...
... 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 the metallic cylinder , producing a dot . On the arrival of a current the ...
Página 51
... cylinder a the receiving station a rotatory motion resembling that of the long hand of a clock governed by the pendulum and escapement . The cloth used for receiving the marks was impregnated with iodide of potassium and muriate of lime ...
... cylinder a the receiving station a rotatory motion resembling that of the long hand of a clock governed by the pendulum and escapement . The cloth used for receiving the marks was impregnated with iodide of potassium and muriate of lime ...
Página 95
... cylinder , N , upon which it is pressed by the jockey - cylinder , N ' . It passes over a guide , G , underneath a hollow drum , R , whose surface is roughened , and then over the thin steel roller , i . The writing - disc , m , upon ...
... cylinder , N , upon which it is pressed by the jockey - cylinder , N ' . It passes over a guide , G , underneath a hollow drum , R , whose surface is roughened , and then over the thin steel roller , i . The writing - disc , m , upon ...
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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...