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 36
... shaft , K , carrying the magnet , in which was seen , through a telescope , R , at a distance of 10 or 12 feet , the reflex of a horizontal scale , s s . The commutator , introduced for directing the currents in one direction or the ...
... shaft , K , carrying the magnet , in which was seen , through a telescope , R , at a distance of 10 or 12 feet , the reflex of a horizontal scale , s s . The commutator , introduced for directing the currents in one direction or the ...
Página 53
... shaft , supporting , on opposite sides , the coils cc ' of an electro - magnet . arranged that , on turning the shaft , the cores of c c ' at the same moment approached , and left the poles of the perma- nent magnet . The ends of the ...
... shaft , supporting , on opposite sides , the coils cc ' of an electro - magnet . arranged that , on turning the shaft , the cores of c c ' at the same moment approached , and left the poles of the perma- nent magnet . The ends of the ...
Página 97
... shaft , and , at its lower , to a horizontal arm , n , which turns upon the shaft . A single projecting tooth , m , on the axis of the wheel M , turns a ratchet - wheel , & , upon an axis fixed in the side of the apparatus . This wheel ...
... shaft , and , at its lower , to a horizontal arm , n , which turns upon the shaft . A single projecting tooth , m , on the axis of the wheel M , turns a ratchet - wheel , & , upon an axis fixed in the side of the apparatus . This wheel ...
Página 153
... shaft which turns the inductor- coil . Thus , while the inductor - coil is turned , and alternate currents generated , the types are moved forward with a cor- responding velocity , and make and break contact by lifting and letting fall ...
... shaft which turns the inductor- coil . Thus , while the inductor - coil is turned , and alternate currents generated , the types are moved forward with a cor- responding velocity , and make and break contact by lifting and letting fall ...
Página 165
... shaft a . At the other end a pallet , g , engages alternately with two parallel scape - wheels , impelled by a clockwork in the case above , and placed so that the thirteen teeth of the front and back wheels alternate when Y ' M M ...
... shaft a . At the other end a pallet , g , engages alternately with two parallel scape - wheels , impelled by a clockwork in the case above , and placed so that the thirteen teeth of the front and back wheels alternate when Y ' M M ...
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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...