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 iv
... give a short and truthful sketch of the origin , rise , and progress of an art grown to an importance sufficient in itself to immortalise its century . Where individual claims to a part of this immortality prominently occurred , they ...
... give a short and truthful sketch of the origin , rise , and progress of an art grown to an importance sufficient in itself to immortalise its century . Where individual claims to a part of this immortality prominently occurred , they ...
Página 7
... give the credit of being the first who pub- lished the idea of applying electricity to the telegraph . This interesting communication is as follows : - " TO THE EDITOR OF THE SCOT'S MAGAZINE . ' Renfrew , Feb. 1st , 1753 . 66 ' SIR ...
... give the credit of being the first who pub- lished the idea of applying electricity to the telegraph . This interesting communication is as follows : - " TO THE EDITOR OF THE SCOT'S MAGAZINE . ' Renfrew , Feb. 1st , 1753 . 66 ' SIR ...
Página 15
... give them credit for having fully appreciated its importance , and for having dedicated their energies to the accomplishment of the task they set themselves , and persevered in the face of many sad difficulties and disappointments . III ...
... give them credit for having fully appreciated its importance , and for having dedicated their energies to the accomplishment of the task they set themselves , and persevered in the face of many sad difficulties and disappointments . III ...
Página 16
... give the explanation of the phenomenon , with * " Essai sur l'Histoire Générale des Sciences pendant la Révolu- tion Française , " par J. B. Biot , p . 9 . This phenomenon , as related by Cotugno , made much sensation at the time in ...
... give the explanation of the phenomenon , with * " Essai sur l'Histoire Générale des Sciences pendant la Révolu- tion Française , " par J. B. Biot , p . 9 . This phenomenon , as related by Cotugno , made much sensation at the time in ...
Página 20
... gives a positive charge , has been called the positive pole , and the copper plate at the bottom of the pile the negative pole . 23. Immediately after the receipt of Volta's letter , by the President of the Royal Society , a pile was ...
... gives a positive charge , has been called the positive pole , and the copper plate at the bottom of the pile the negative pole . 23. Immediately after the receipt of Volta's letter , by the President of the Royal Society , a pile was ...
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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...