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 4
... side , and a deficiency , necessarily to the same amount , would occur on the other . Hence he gave the name of positive electricity to that which Dufay had called vitreous , and negative to that called resinous . Dufay , without the ...
... side , and a deficiency , necessarily to the same amount , would occur on the other . Hence he gave the name of positive electricity to that which Dufay had called vitreous , and negative to that called resinous . Dufay , without the ...
Página 31
... side , and the desire to have sketches which aided the comprehension ,. on the other . The description of this electro - magnet and of its properties undoubtedly suggested to Morse , either then or afterwards , the idea of employing it ...
... side , and the desire to have sketches which aided the comprehension ,. on the other . The description of this electro - magnet and of its properties undoubtedly suggested to Morse , either then or afterwards , the idea of employing it ...
Página 43
... side of the plate , which served at the same time as a cover for the case containing the multipliers , was marked with twenty letters of the alphabet , c , J , Q , U , and z being omitted , as capable of being replaced by others , at ...
... side of the plate , which served at the same time as a cover for the case containing the multipliers , was marked with twenty letters of the alphabet , c , J , Q , U , and z being omitted , as capable of being replaced by others , at ...
Página 44
... side , so that by observing the deflections of any two needles , and following with the eye the direction pointed out by their nearer ends , at the point of intersection of these imaginary lines would be found the letter intended to be ...
... side , so that by observing the deflections of any two needles , and following with the eye the direction pointed out by their nearer ends , at the point of intersection of these imaginary lines would be found the letter intended to be ...
Página 51
... side of the wheel was a spring contact , only one of which made contact with the wheel at the same time ; when the one pressed against a tooth , the other was always opposite to a space . These springs were connected to two line wires ...
... side of the wheel was a spring contact , only one of which made contact with the wheel at the same time ; when the one pressed against a tooth , the other was always opposite to a space . These springs were connected to two line wires ...
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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...