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 23
... deflect a magnet needle , as well as to polarize an unmagnetized one , were known to , and described as early as 1804 , by Professor Izarn , in his " Manuel du Galvanisme . " The paragraph which especially refers to this subject is ...
... deflect a magnet needle , as well as to polarize an unmagnetized one , were known to , and described as early as 1804 , by Professor Izarn , in his " Manuel du Galvanisme . " The paragraph which especially refers to this subject is ...
Página 24
... deflected , and take up a position indicated by the dotted line n s , at nearly right angles to the wire . When the current is re- versed the poles will be deflected in the other direction , the pole n being where s is , in the figure ...
... deflected , and take up a position indicated by the dotted line n s , at nearly right angles to the wire . When the current is re- versed the poles will be deflected in the other direction , the pole n being where s is , in the figure ...
Página 26
... deflected needles at the other . This telegraph , as imagined by Ampère , was , however , doomed to the same fate as ... deflections of which , to the right or left hand , were to supply the elementary signals for the construction of an ...
... deflected needles at the other . This telegraph , as imagined by Ampère , was , however , doomed to the same fate as ... deflections of which , to the right or left hand , were to supply the elementary signals for the construction of an ...
Página 27
... deflected . This telegraph was first exhibited in public , some years later than the date of its invention , by Mr. Alexander , of Edinburgh . He divided his thirty wires into twenty - six letters of the alphabet , three signs of ...
... deflected . This telegraph was first exhibited in public , some years later than the date of its invention , by Mr. Alexander , of Edinburgh . He divided his thirty wires into twenty - six letters of the alphabet , three signs of ...
Página 28
... deflections of this needle to the right and left , by changing the poles of the battery at the ends of the wires , to give all the signals necessary for a complete correspondence . His call signal was given by means of an alarm ...
... deflections of this needle to the right and left , by changing the poles of the battery at the ends of the wires , to give all the signals necessary for a complete correspondence . His call signal was given by means of an alarm ...
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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...