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
... goes , the author has done his best , with the scanty materials and limited space at his command , to give a short and truthful sketch of the origin , rise , and progress of an art grown to an importance sufficient in itself to ...
... goes , the author has done his best , with the scanty materials and limited space at his command , to give a short and truthful sketch of the origin , rise , and progress of an art grown to an importance sufficient in itself to ...
Página vi
... Muscovy for the purpose of trying the experiment , but that if he chose to go there himself I would remain in Venice and attend to the rest . " Things are little changed in this regard since Galileo's days vi PREFACE .
... Muscovy for the purpose of trying the experiment , but that if he chose to go there himself I would remain in Venice and attend to the rest . " Things are little changed in this regard since Galileo's days vi PREFACE .
Página vii
... go , which have been admitted into this book , the author has endeavoured to follow the example of Sagredus , by dismissing those which , from their pro- fessions , claimed a passing attention , but which , on nearer inquiry , turned ...
... go , which have been admitted into this book , the author has endeavoured to follow the example of Sagredus , by dismissing those which , from their pro- fessions , claimed a passing attention , but which , on nearer inquiry , turned ...
Página 12
... go isochronously ; and as the dials moved round , the same letter always appeared through the orifices of each of these screens . The pith - ball electrometers were hung in front of the dials . " The Electric Telegraph , " by E. Highton ...
... go isochronously ; and as the dials moved round , the same letter always appeared through the orifices of each of these screens . The pith - ball electrometers were hung in front of the dials . " The Electric Telegraph , " by E. Highton ...
Página 14
... go isochronously during the time that intelligence was being transmitted ; for it was easy enough by a preconcerted arrangement between the parties , and upon a given signal , for each party to start their clocks at the same letter ...
... go isochronously during the time that intelligence was being transmitted ; for it was easy enough by a preconcerted arrangement between the parties , and upon a given signal , for each party to start their clocks at the same letter ...
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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...