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 11
... strips of tinfoi pasted on square plates of glass . Such letters are shown in Fig . 3. An electric discharge from the interior coating of a Fig . 3 . ― con- Leyden jar being sent , for instance , through the double strips of tinfoil ...
... strips of tinfoi pasted on square plates of glass . Such letters are shown in Fig . 3. An electric discharge from the interior coating of a Fig . 3 . ― con- Leyden jar being sent , for instance , through the double strips of tinfoil ...
Página 40
... strip of paper travelling before them they each printed a dot . Two plates , h h ' , prevented the needles from being deflected in the direction opposite to that in M N M he m Fig , 16 . m MM O S N O S h ' Fig . 17 . which they were to ...
... strip of paper travelling before them they each printed a dot . Two plates , h h ' , prevented the needles from being deflected in the direction opposite to that in M N M he m Fig , 16 . m MM O S N O S h ' Fig . 17 . which they were to ...
Página 42
... strips ; sometimes small hammers were substituted for the ink reservoirs , striking against bells of glass or metal of different notes . Thus Steinheil's appa- ratus formed also , upon occasion , an acoustic telegraph . The history of ...
... strips ; sometimes small hammers were substituted for the ink reservoirs , striking against bells of glass or metal of different notes . Thus Steinheil's appa- ratus formed also , upon occasion , an acoustic telegraph . The history of ...
Página 45
... strips , P and N , to which the poles of a voltaic battery were connected . With this arrangement , the operator , by pressing down , at the same time , the buttons of two springs , one over each of the strips P and N , could 6 O - 00 3 ...
... strips , P and N , to which the poles of a voltaic battery were connected . With this arrangement , the operator , by pressing down , at the same time , the buttons of two springs , one over each of the strips P and N , could 6 O - 00 3 ...
Página 47
... strip of ivory . The spring , a , could be pressed against b ; but , when untouched , remained separated from it by its own elasticity . From the positive pole of the battery , a wire , 1 , went to the electro - magnet , u , of the ...
... strip of ivory . The spring , a , could be pressed against b ; but , when untouched , remained separated from it by its own elasticity . From the positive pole of the battery , a wire , 1 , went to the electro - magnet , u , of the ...
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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...