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 12
... single line in the air , over a space of twenty - seven miles , beween Madrid and Aranjuez . He employed a battery of Leyden jars , and re- ceived signals by observing the divergence of suspended pith balls . 17. Cavallo was the next ...
... single line in the air , over a space of twenty - seven miles , beween Madrid and Aranjuez . He employed a battery of Leyden jars , and re- ceived signals by observing the divergence of suspended pith balls . 17. Cavallo was the next ...
Página 25
... single wire . The same would be reached by joining b and b ' by a wire , and letting a current of equal strength pass from a to b , b ' , and a ' . 28. Professor Schweigger , of Halle , the same who sug- gested improvements of ...
... single wire . The same would be reached by joining b and b ' by a wire , and letting a current of equal strength pass from a to b , b ' , and a ' . 28. Professor Schweigger , of Halle , the same who sug- gested improvements of ...
Página 26
... single magnet needle , the deflections of which , to the right or left hand , were to supply the elementary signals for the construction of an alphabet . But two serious inconveniences - the irre- gularity of the batteries , and , above ...
... single magnet needle , the deflections of which , to the right or left hand , were to supply the elementary signals for the construction of an alphabet . But two serious inconveniences - the irre- gularity of the batteries , and , above ...
Página 27
... single wire . 31. In 1825 , Mr. Sturgeon , of London , discovered that when a soft iron bar is surrounded by a helix of wire , through which a galvanic current is passing , it acquires magnetism , which lasts only as long as the current ...
... single wire . 31. In 1825 , Mr. Sturgeon , of London , discovered that when a soft iron bar is surrounded by a helix of wire , through which a galvanic current is passing , it acquires magnetism , which lasts only as long as the current ...
Página 28
... the systems of five and single needle instruments , the latter as an improvement on the former ; but his constructions appear to have been of a complicated nature , and therefore unsuitable for practical use 28 THE ELECTRIC TELEGRAPH .
... the systems of five and single needle instruments , the latter as an improvement on the former ; but his constructions appear to have been of a complicated nature , and therefore unsuitable for practical use 28 THE ELECTRIC TELEGRAPH .
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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...