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 xii
... Posts , preservative 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 ...
... Posts , preservative 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 ...
Página 215
... posts generally pressed into the service of the telegraph abroad are young firs ( Pinus sylvestris ) . They are selected from 25 to 30 feet long , and at the top seldom less than 5 inches diameter . The bark is stripped off , and the posts ...
... posts generally pressed into the service of the telegraph abroad are young firs ( Pinus sylvestris ) . They are selected from 25 to 30 feet long , and at the top seldom less than 5 inches diameter . The bark is stripped off , and the posts ...
Página 219
... posts are of the same height , but of larger diameter and stronger than the ordinary ones . M. Siemens ' post derives much of its merit from the rôle played by the buckled plate at the bottom . These buckled plates are things of great ...
... posts are of the same height , but of larger diameter and stronger than the ordinary ones . M. Siemens ' post derives much of its merit from the rôle played by the buckled plate at the bottom . These buckled plates are things of great ...
Página 222
... post . The W Fig . 104 . Fig . 105 line - wire is carried by a stalk cemented into the inner recess of the bell . The chief merit of this insulator is its cheapness . In climates like that of Spain it answers well enough , but would be ...
... post . The W Fig . 104 . Fig . 105 line - wire is carried by a stalk cemented into the inner recess of the bell . The chief merit of this insulator is its cheapness . In climates like that of Spain it answers well enough , but would be ...
Página 225
... posts to be slackened , and also , in case of a rupture , gives sufficient space for making a joint . In Fig . 110 . 140. Lieut . - Col . Chauvin has also constructed an insulator belonging to this class , for attaching to the stems of ...
... posts to be slackened , and also , in case of a rupture , gives sufficient space for making a joint . In Fig . 110 . 140. Lieut . - Col . Chauvin has also constructed an insulator belonging to this class , for attaching to the stems of ...
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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...