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 39
... space of time , and for this purpose allowed the contact springs of his commutator to make contact with the lines ... spaces , and made contact only at a and b , whilst in every other position the circuit was interrupted . The receiving ...
... space of time , and for this purpose allowed the contact springs of his commutator to make contact with the lines ... spaces , and made contact only at a and b , whilst in every other position the circuit was interrupted . The receiving ...
Página 40
... space before the next signal . These signals were necessarily only dots , because induction currents are only of momentary duration . Much nicety was required in obtaining magnets of exactly the right size . They could not , for example ...
... space before the next signal . These signals were necessarily only dots , because induction currents are only of momentary duration . Much nicety was required in obtaining magnets of exactly the right size . They could not , for example ...
Página 51
... spaces in rotation represented thirty letters of the alphabet , numerals , & c . On each side of the wheel was a spring ... space . These springs were connected to two line wires , and a battery was inserted between the tooth - wheel and ...
... spaces in rotation represented thirty letters of the alphabet , numerals , & c . On each side of the wheel was a spring ... space . These springs were connected to two line wires , and a battery was inserted between the tooth - wheel and ...
Página 65
... space between the signs composing a letter = 1 dot . 99 " " " " " " two letters of a word two following words = 3 dots . = 6 dots . The formation of the numerals is ingenious ; they are each represented by five of the two elements , so ...
... space between the signs composing a letter = 1 dot . 99 " " " " " " two letters of a word two following words = 3 dots . = 6 dots . The formation of the numerals is ingenious ; they are each represented by five of the two elements , so ...
Página 77
... spaces . He therefore constructed an arrangement for facilitating the transmission . On a metal plate , B B , Fig . 34 , are soldered series of raised rectangular pieces of metal , whose lengths and distances apart correspond with the ...
... spaces . He therefore constructed an arrangement for facilitating the transmission . On a metal plate , B B , Fig . 34 , are soldered series of raised rectangular pieces of metal , whose lengths and distances apart correspond with the ...
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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...