The Electric Telegraph PopularisedWalton and Maberly, 1855 - 240 páginas |
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Términos y frases comunes
alarum already described armature arrival axis Belgian Calais celerity of transmission centre Chap cipher clock coil commutator conducting wire constructed copper corresponding deflections dial DIONYSIUS LARDNER direction disc dispatch distance distant station double needle Dover earth electric current Electric Telegraph Company electro-magnet established expedient explained forms of telegraph French telegraph galvanometer gutta percha hand Holyhead imparted indicating apparatus intensity LARDNER'S MUSEUM length letters lever line of wires line wire line-wire Liverpool London manner means messages metallic miles Morse motion moved MUSEUM OF SCIENCE necessary needle instrument needle telegraph Newton Junction number of words observations operation Ostend pass perforated placed pole Portpatrick position produced projecting arm pulsations railway telegraph ratchet-wheel received represented in fig ribbon of paper roller Sardinia screw sent signals spring stop submarine cable succession suspended tariff tele telegraphic instruments telegraphic lines telegraphists terminal stations tion Trieste wheel York zinc
Pasajes populares
Página 103 - Canst thou lift up thy voice to the clouds, That abundance of waters may cover thee? Canst thou send lightnings, that they may go, And say unto thee, Here we are?
Página 91 - THE ELECTRIC TELEGRAPH POPULARISED. To render intelligible to all who can Read, irrespective of any previous Scientific Acquirements, the various forms of Telegraphy in Actual Operation. 100 Illustrations, cloth gilt, is. 6d. Dr. Lardner s Handbooks of Natural Philosophy.
Página 157 - ... a plateau, which seems to have been placed there especially for the purpose of holding the wires of a submarine telegraph, and of keeping them out of harm's way. It is neither too deep nor too shallow ; yet it is so deep that the wires, but once landed, will remain forever beyond the reach of vessels...
Página 141 - POPULAR PHYSICS. Containing Magnitude and Minuteness, the Atmosphere, Meteoric Stones, Popular Fallacies, Weather Prognostics, the Thermometer, the Barometer, Sound, &c. 85 Illustrations, cloth gilt, 2s.
Página 112 - In a commercial point of view, the line in question assumes a gigantic importance, and presents itself not only in the attitude of a means of communication between the opposite extremes of a single country, however great, but as a channel for imparting knowledge between distant parts of the earth. With the existing facilities, it requires months to convey information from the sunny climes of the East to the less favored, in point of climate, but not less important regions of the West, teeming as...
Página 157 - ... sand, gravel, and other matter; but not a particle of sand or gravel was found among them. Hence the inference that these depths of the sea are not disturbed either by waves or currents. Consequently, a telegraphic wire once laid there, there it would remain, as completely beyond the reach of accident as it would be if buried in air-tight cases.
Página 203 - To produce the effects, whatever these may be, by which the telegraphic messages are expressed, it is necessary that the electric current shall have a certain intensity. Now, the intensity of the current transmitted by a given voltaic battery along a given line of wire will decrease, other things being the same, in the same proportion as the length of the wire increases. Thus, if the wire be continued for ten miles, the current will have twice the intensity which it would have if the wire had been...
Página 68 - AM — Special train arrived. Officers have taken the two thieves into custody, a lady having lost her bag containing a purse with two sovereigns and some silver in it; one of the sovereigns was sworn to by the lady as having been her property. It was found in Fiddler Dick's watch-fob." "It appears," continues the writer, "that on the arrival of the train, a policeman opened the door of the 'third compartment of the first second-class carriage,' and asked the passengers if they missed anything.