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 vi
... into Egypt or Muscovy for the purpose of trying the experiment , but that if he chose to go there himself I would remain in Venice and attend to the rest . " Things are little changed in this regard since Galileo's days vi PREFACE .
... into Egypt or Muscovy for the purpose of trying the experiment , but that if he chose to go there himself I would remain in Venice and attend to the rest . " Things are little changed in this regard since Galileo's days vi PREFACE .
Página 43
... - plate , with pointers attached to the axes of the magnet- needles , broken away in the middle , to show the multipliers . Each pointer was deflected from its position of rest always THE ELECTRIC TELEGRAPH . 43 Davy's Telegraph.
... - plate , with pointers attached to the axes of the magnet- needles , broken away in the middle , to show the multipliers . Each pointer was deflected from its position of rest always THE ELECTRIC TELEGRAPH . 43 Davy's Telegraph.
Página 44
... rest always under the same angle on each 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 ...
... rest always under the same angle on each 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 ...
Página 56
... rest k . On turning the handle to the right , however , the spring is lifted by the projection i from the rest k , and the projection makes contact with 7 , whilst t and 7 ' remain unmoved . The spring is not seen in the figure . The ...
... rest k . On turning the handle to the right , however , the spring is lifted by the projection i from the rest k , and the projection makes contact with 7 , whilst t and 7 ' remain unmoved . The spring is not seen in the figure . The ...
Página 61
... rest , it traverses the coils of the electro - magnet M ' , and then goes through the earth back again to the battery B. 55. Simple Morse Embosser for two Stations with Relay.— When the line connecting two stations is long it is im ...
... rest , it traverses the coils of the electro - magnet M ' , and then goes through the earth back again to the battery B. 55. Simple Morse Embosser for two Stations with Relay.— When the line connecting two stations is long it is im ...
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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...