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 11
... construction of a telegraph by means of electrical dis- charges passing over the parts of a broken conductor enclosed in a glass tube , or by letters formed by spaces cut out of parallel strips of tinfoi pasted on square plates of glass ...
... construction of a telegraph by means of electrical dis- charges passing over the parts of a broken conductor enclosed in a glass tube , or by letters formed by spaces cut out of parallel strips of tinfoi pasted on square plates of glass ...
Página 22
... construction of this telegraph - the first in which voltaic electricity was employed - involved an outlay which , in conjunction with the slowness of working , would have prevented its commercial utility even if the science had not ...
... construction of this telegraph - the first in which voltaic electricity was employed - involved an outlay which , in conjunction with the slowness of working , would have prevented its commercial utility even if the science had not ...
Página 26
... construction of an alphabet . But two serious inconveniences - the irre- gularity of the batteries , and , above all , the rapid decrease “ Annales de Physique et de Chemie , ” vol . xv . p . 72 . of their intensity - only permitted the ...
... construction of an alphabet . But two serious inconveniences - the irre- gularity of the batteries , and , above all , the rapid decrease “ Annales de Physique et de Chemie , ” vol . xv . p . 72 . of their intensity - only permitted the ...
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 .
Página 42
... construction enabled the operator to transmit to , and receive from , either Bogen- hausen or Lerchenstrasse at pleasure . It was arranged that when the indicator was in circuit with one station , the wire of the other should be ...
... construction enabled the operator to transmit to , and receive from , either Bogen- hausen or Lerchenstrasse at pleasure . It was arranged that when the indicator was in circuit with one station , the wire of the other should be ...
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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...