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
... methods and 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 ...
... methods and 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 ...
Página x
... with Relay 56. Another Method 57. The Morse Code 58. Transmitting Keys 59. Submarine Keys . 60. Siemens ' Submarine Key • 54 54 54 • 57 57 57 58 · 59 61 61 63 66 • 67 68 § 61. De Sauty's Submarine Key 62. Varley's Switch 63. X CONTENTS .
... with Relay 56. Another Method 57. The Morse Code 58. Transmitting Keys 59. Submarine Keys . 60. Siemens ' Submarine Key • 54 54 54 • 57 57 57 58 · 59 61 61 63 66 • 67 68 § 61. De Sauty's Submarine Key 62. Varley's Switch 63. X CONTENTS .
Página xi
... Method of Translation between a Line with closed and one with open Circuit 115 • 84. Method of Translation between two Lines with closed Circuit 117 85. Methods of Telegraphing in opposite Directions at the same Time in a Single Wire 86 ...
... Method of Translation between a Line with closed and one with open Circuit 115 • 84. Method of Translation between two Lines with closed Circuit 117 85. Methods of Telegraphing in opposite Directions at the same Time in a Single Wire 86 ...
Página xii
... Methods 129. Iron and Stone Posts 130. Siemens ' Iron Post 131. Menans ' Iron Post 132. Line Insulators 133. Clark's " " 134. Spanish 99 215 . 215 218 218 220 220 221 222 $ 135. Belgian Insulators . 136. French 137. Varley's 99 xii ...
... Methods 129. Iron and Stone Posts 130. Siemens ' Iron Post 131. Menans ' Iron Post 132. Line Insulators 133. Clark's " " 134. Spanish 99 215 . 215 218 218 220 220 221 222 $ 135. Belgian Insulators . 136. French 137. Varley's 99 xii ...
Página 7
... , vol . xv . , p . 73. The page is headed , “ An expe- ditious method of conveying intelligence . " wire , from one place to another , without being THE ELECTRIC TELEGRAPH . 7 Franklin's Theory Terms “positive” and “negative.
... , vol . xv . , p . 73. The page is headed , “ An expe- ditious method of conveying intelligence . " wire , from one place to another , without being THE ELECTRIC TELEGRAPH . 7 Franklin's Theory Terms “positive” and “negative.
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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...