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 xi
... Directions at the same Time in a Single Wire 86. Gintl's Method with Relays 119 • 119 87 . 99 99 by Chemical Means • 122 in the same Direction at the same Time 91 . 96. Siemens ' 97. Borggreve's 88. Plan of Frischen and Siemens . 89 ...
... Directions at the same Time in a Single Wire 86. Gintl's Method with Relays 119 • 119 87 . 99 99 by Chemical Means • 122 in the same Direction at the same Time 91 . 96. Siemens ' 97. Borggreve's 88. Plan of Frischen and Siemens . 89 ...
Página 24
... direction , the pole n being where s is , in the figure . It will become evident on regarding the figure also that , if a similar current pass in the lower wire from b ' to a ' , it must produce the same magnetic direction upon the ...
... direction , the pole n being where s is , in the figure . It will become evident on regarding the figure also that , if a similar current pass in the lower wire from b ' to a ' , it must produce the same magnetic direction upon the ...
Página 25
... direction of the current is reversed , and the position of the observer must be supposed to be reversed also - head ... directions , they act in the same sense on the magnetic needle Ns , and , other things being equal , their combined ...
... direction of the current is reversed , and the position of the observer must be supposed to be reversed also - head ... directions , they act in the same sense on the magnetic needle Ns , and , other things being equal , their combined ...
Página 27
... direction throughout , supposing the horse - shoe to be bent straight . Fig . 10 . The positions of the poles depend , of course , upon the direction in which the spirals are wound , and upon the direction in which the current traverses ...
... direction throughout , supposing the horse - shoe to be bent straight . Fig . 10 . The positions of the poles depend , of course , upon the direction in which the spirals are wound , and upon the direction in which the current traverses ...
Página 30
... direction depended upon the pole inserted and the end of the spiral with regard to the direction of its windings . He says , " If such a hollow helix as that described . be laid east and west , or in any other constant position , and a ...
... direction depended upon the pole inserted and the end of the spiral with regard to the direction of its windings . He says , " If such a hollow helix as that described . be laid east and west , or in any other constant position , and a ...
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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...