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 iii
... apparatus in use at the present day ; the second being devoted exclusively to the more scientific part of the subject , dealing particularly with matter having an immediate relation to submarine work . It has now been decided to ...
... apparatus in use at the present day ; the second being devoted exclusively to the more scientific part of the subject , dealing particularly with matter having an immediate relation to submarine work . It has now been decided to ...
Página vii
... apparatus go , which have been admitted into this book , the author has endeavoured to follow the example of Sagredus , by dismissing those which , from their pro- fessions , claimed a passing attention , but which , on nearer inquiry ...
... apparatus go , which have been admitted into this book , the author has endeavoured to follow the example of Sagredus , by dismissing those which , from their pro- fessions , claimed a passing attention , but which , on nearer inquiry ...
Página xi
... Apparatus 76. Siemens ' 77. Translation , or Re - transmission of Morse Signals 78. Varley's Translating Apparatus Siemens and Halske's 91 94 94 96 98 99 . 102 79. Polarised Ink - recorder as Submarine Key 106 80. The Translation Spring ...
... Apparatus 76. Siemens ' 77. Translation , or Re - transmission of Morse Signals 78. Varley's Translating Apparatus Siemens and Halske's 91 94 94 96 98 99 . 102 79. Polarised Ink - recorder as Submarine Key 106 80. The Translation Spring ...
Página 25
... apparatus made by coiling a wire several times round a magnetic needle , and found that the deflecting force increased with the number of turns . Such an apparatus , called an electro - magnetic multiplier , is shown in Fig . 9 . It has ...
... apparatus made by coiling a wire several times round a magnetic needle , and found that the deflecting force increased with the number of turns . Such an apparatus , called an electro - magnetic multiplier , is shown in Fig . 9 . It has ...
Página 34
... apparatus consisted of three parts : - 1. The apparatus for production of the currents ; 2. The receiving instrument ; and 3. The commutator , or instrument for reversing the currents . The arrangements used by Gauss and Weber for the ...
... apparatus consisted of three parts : - 1. The apparatus for production of the currents ; 2. The receiving instrument ; and 3. The commutator , or instrument for reversing the currents . The arrangements used by Gauss and Weber for 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...