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 2
... pieces of sticks in its vicinity . Pliny ( 70 A.D. ) , as well as other naturalists , both Greek and Roman , remarked ... piece of flannel . On approaching the cylinder with his finger he obtained , for the first time , the spark , and ...
... pieces of sticks in its vicinity . Pliny ( 70 A.D. ) , as well as other naturalists , both Greek and Roman , remarked ... piece of flannel . On approaching the cylinder with his finger he obtained , for the first time , the spark , and ...
Página 3
... piece of feather ; the other end was brought into contact with an excited glass tube . When Grey rubbed the tube Wheeler observed the bit of feather attracted towards the ivory ball . Experimenting in this way on one occasion , one of ...
... piece of feather ; the other end was brought into contact with an excited glass tube . When Grey rubbed the tube Wheeler observed the bit of feather attracted towards the ivory ball . Experimenting in this way on one occasion , one of ...
Página 4
... piece of resin . This occasioned the former to be called vitreous electricity , and the latter resinous electricity . 7. Benjamin Franklin believed , however , in the existence of only a single fluid , and explained the phenomena by sup ...
... piece of resin . This occasioned the former to be called vitreous electricity , and the latter resinous electricity . 7. Benjamin Franklin believed , however , in the existence of only a single fluid , and explained the phenomena by sup ...
Página 8
... piece of glass , at six inches from the end ; and let that part of them which reaches from the glass to the machine have sufficient spring and stiffness to recover its situation after having been brought in contact with the barrel ...
... piece of glass , at six inches from the end ; and let that part of them which reaches from the glass to the machine have sufficient spring and stiffness to recover its situation after having been brought in contact with the barrel ...
Página 15
... pieces of different metals - silver and zinc - and placing one of them above and the other underneath his tongue , he found that , so long as the metals did not make contact with each other , he felt nothing ; but that when the edges ...
... pieces of different metals - silver and zinc - and placing one of them above and the other underneath his tongue , he found that , so long as the metals did not make contact with each other , he felt nothing ; but that when the edges ...
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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...