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 vii
... passing attention , but which , on nearer inquiry , turned out to belong , in his opinion , to the category of the fantastical . 3 , DELAHAY STREET , WESTMINSTER . CONTENTS . PAGE 1 1 2 I. EARLY OBSERVATIONS OF PREFACE . vii.
... passing attention , but which , on nearer inquiry , turned out to belong , in his opinion , to the category of the fantastical . 3 , DELAHAY STREET , WESTMINSTER . CONTENTS . PAGE 1 1 2 I. EARLY OBSERVATIONS OF PREFACE . vii.
Página 3
... pass to the further end of the line . One end of the line supported . an electrometer formed of a small ivory ball and piece of feather ; the other end was brought into contact with an excited glass tube . When Grey rubbed the tube ...
... pass to the further end of the line . One end of the line supported . an electrometer formed of a small ivory ball and piece of feather ; the other end was brought into contact with an excited glass tube . When Grey rubbed the tube ...
Página 11
... passing over the parts of a broken conductor enclosed in a glass tube , or by letters formed by spaces cut out of ... pass over each of the intervening spaces at the same time , and the letter would appear beautifully illuminated in the ...
... passing over the parts of a broken conductor enclosed in a glass tube , or by letters formed by spaces cut out of ... pass over each of the intervening spaces at the same time , and the letter would appear beautifully illuminated in the ...
Página 15
... pass with as little profit as Sulzer had done , was a student of medicine in Bologna . Cotugno , professor of anatomy in Naples , in an article in the " Journal Encyclopédique de Bologne " THE ELECTRIC TELEGRAPH . 15 TELEGRAPHS BY ...
... pass with as little profit as Sulzer had done , was a student of medicine in Bologna . Cotugno , professor of anatomy in Naples , in an article in the " Journal Encyclopédique de Bologne " THE ELECTRIC TELEGRAPH . 15 TELEGRAPHS BY ...
Página 21
... passing from one terminal traversed its line wire to the voltameter at the receiving station , where it passed between the gold points corresponding to the terminals touched by the poles , and returned through the other line wire to the ...
... passing from one terminal traversed its line wire to the voltameter at the receiving station , where it passed between the gold points corresponding to the terminals touched by the poles , and returned through the other line wire to the ...
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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...