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 22
... holes , 1 , to receive the poles в and c of the voltaic pile P N. The construction of this telegraph - the first in which voltaic electricity was employed - involved an outlay which , in conjunction with the slowness of working , would ...
... holes , 1 , to receive the poles в and c of the voltaic pile P N. The construction of this telegraph - the first in which voltaic electricity was employed - involved an outlay which , in conjunction with the slowness of working , would ...
Página 75
... holes 1 and 2 of the commutator c . On giving a signal by pressing down the key , contacts between a and c by the beam , and between a and b by the spring moved by the lever before mentioned , are established . By means of the former ...
... holes 1 and 2 of the commutator c . On giving a signal by pressing down the key , contacts between a and c by the beam , and between a and b by the spring moved by the lever before mentioned , are established . By means of the former ...
Página 80
... holes for screw- plugs . The two ends of the electro - magnet coils are con- nected on each side with the first and last pieces , and the line and earth with the middle ones . By altering the places of the plugs , therefore , the coils ...
... holes for screw- plugs . The two ends of the electro - magnet coils are con- nected on each side with the first and last pieces , and the line and earth with the middle ones . By altering the places of the plugs , therefore , the coils ...
Página 81
... hole for a contact - plug , by removing which the operator can break the circuit of his local battery at pleasure . 67. Polarised or magnetic relays - those belonging to the other class are preferable to the simple electro - magnetic ...
... hole for a contact - plug , by removing which the operator can break the circuit of his local battery at pleasure . 67. Polarised or magnetic relays - those belonging to the other class are preferable to the simple electro - magnetic ...
Página 93
... the point of the levelling screw , b . The fore part of the brass neck , a , is cut out in a curve , and forms a gutter , in which the lower half of the printing - disc , c , dips . At d a round hole in the upper. THE ELECTRIC TELEGRAPH .
... the point of the levelling screw , b . The fore part of the brass neck , a , is cut out in a curve , and forms a gutter , in which the lower half of the printing - disc , c , dips . At d a round hole in the upper. THE ELECTRIC TELEGRAPH .
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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...