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 46
... lever p . On the Fig . 20 . other end of p was a soft iron armature , v , which , when a current passed through the coil , u , of the electro - magnet , was attracted , and released the wheel . The case contained 46 THE ELECTRIC TELEGRAPH .
... lever p . On the Fig . 20 . other end of p was a soft iron armature , v , which , when a current passed through the coil , u , of the electro - magnet , was attracted , and released the wheel . The case contained 46 THE ELECTRIC TELEGRAPH .
Página 48
... lever , the oscillations of which by the hand of the operator alternately close and break the circuit of a galvanic battery at the sending station , and of an electro - magnet whose wire coils are in the line circuit at the receiving ...
... lever , the oscillations of which by the hand of the operator alternately close and break the circuit of a galvanic battery at the sending station , and of an electro - magnet whose wire coils are in the line circuit at the receiving ...
Página 49
... lever turning on the axis , supported by uprights which were screwed into a small Fig . 21 . block of dry wood . The screw on the longer arm of the lever was pressed upon the front contact , whilst the similar screw in the shorter arm ...
... lever turning on the axis , supported by uprights which were screwed into a small Fig . 21 . block of dry wood . The screw on the longer arm of the lever was pressed upon the front contact , whilst the similar screw in the shorter arm ...
Página 60
... lever K , and the earth . When the lever K is not being manipulated , it is held by a spring upon the metal point 2 , between which and the earth are inserted the coils of the electro - magnet м , whose armature is em- ployed to mark ...
... lever K , and the earth . When the lever K is not being manipulated , it is held by a spring upon the metal point 2 , between which and the earth are inserted the coils of the electro - magnet м , whose armature is em- ployed to mark ...
Página 61
... lever of the key K. Its purpose is to show the presence of current in the line , and to give a rough idea of its strength . The front or working contact 1 of the key is connected with the pole , c , of the line battery B , and the other ...
... lever of the key K. Its purpose is to show the presence of current in the line , and to give a rough idea of its strength . The front or working contact 1 of the key is connected with the pole , c , of the line battery B , and the other ...
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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...