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 27
... lifting power , is shown in Fig . 10. For this purpose , pieces of soft iron were bent in the form of a horse - shoe , round the horns of which he wound spirally a length of well insulated copper wire . One end of the magnet so arranged ...
... lifting power , is shown in Fig . 10. For this purpose , pieces of soft iron were bent in the form of a horse - shoe , round the horns of which he wound spirally a length of well insulated copper wire . One end of the magnet so arranged ...
Página 34
... lifting up the bobbin by the handles , a current would be induced in the coil in one direction ; and on lowering it again , a current would traverse the coil in the * In the apparatus constructed at a later date by Gauss and Weber they ...
... lifting up the bobbin by the handles , a current would be induced in the coil in one direction ; and on lowering it again , a current would traverse the coil in the * In the apparatus constructed at a later date by Gauss and Weber they ...
Página 36
... lifting up the coil a a , Fig . 12 , from the stool to the top of the vertical magnet - bars , a current was induced in the wire encircling them . This current passed by the commu- tator , placed , as in Fig . 14 , from a to b , through ...
... lifting up the coil a a , Fig . 12 , from the stool to the top of the vertical magnet - bars , a current was induced in the wire encircling them . This current passed by the commu- tator , placed , as in Fig . 14 , from a to b , through ...
Página 37
... lifting the coil a a , if we suppose a deflection of the magnet was produced to the right , by reversing the commu- tator and then lowering the coil again , another deflection in the same direction would be observed . To produce a third ...
... lifting the coil a a , if we suppose a deflection of the magnet was produced to the right , by reversing the commu- tator and then lowering the coil again , another deflection in the same direction would be observed . To produce a third ...
Página 39
... lifting about five times its own weight . Two induction coils , of together 15,000 convolutions of insulated copper wire , turned on an arbor , and presented in rotation the axes of the coils to the poles of the magnet , so that when ...
... lifting about five times its own weight . Two induction coils , of together 15,000 convolutions of insulated copper wire , turned on an arbor , and presented in rotation the axes of the coils to the poles of the magnet , so that when ...
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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...