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 v
... distance , but failed to see his way to the attainment of that object . In one of his dialogues on the two great rival astronomical systems , written in 1632 , he makes Sagredus say : " Tu facis ut meminerim alicujus , PREFACE .
... distance , but failed to see his way to the attainment of that object . In one of his dialogues on the two great rival astronomical systems , written in 1632 , he makes Sagredus say : " Tu facis ut meminerim alicujus , PREFACE .
Página vi
... distance , the action would be scarcely discernible ; so I dismissed the fellow , and said that it was not convenient for me just then to travel into Egypt or Muscovy for the purpose of trying the experiment , but that if he chose to go ...
... distance , the action would be scarcely discernible ; so I dismissed the fellow , and said that it was not convenient for me just then to travel into Egypt or Muscovy for the purpose of trying the experiment , but that if he chose to go ...
Página 2
... distance through an insulated wire is that of Stephen Grey , pensioner of the Charter House . Grey , having succeeded in electrifying a glass tube open at both ends , was desirous of finding out whether he could obtain the same result ...
... distance through an insulated wire is that of Stephen Grey , pensioner of the Charter House . Grey , having succeeded in electrifying a glass tube open at both ends , was desirous of finding out whether he could obtain the same result ...
Página 5
... distance to which the electric attraction could be observed in an insulated wire . Winckler , in Leipsic , and Lemonnier , of Paris , in 1746 , and Dr. Watson , Bishop of Landaff . in 1747 , took up the same inquiry . 8. The discovery ...
... distance to which the electric attraction could be observed in an insulated wire . Winckler , in Leipsic , and Lemonnier , of Paris , in 1746 , and Dr. Watson , Bishop of Landaff . in 1747 , took up the same inquiry . 8. The discovery ...
Página 7
... distance of earth , at Stoke Newington ; and on the 14th of August , in the same year , repeated his experiments on a considerably larger scale , transmitting the electric impulse through 10,600 feet of wire suspended from insulators of ...
... distance of earth , at Stoke Newington ; and on the 14th of August , in the same year , repeated his experiments on a considerably larger scale , transmitting the electric impulse through 10,600 feet of wire suspended from insulators of ...
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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...