Description of the American Electro Magnetic Telegraph: Now in Operation Between the Cities of Washington and Baltimore. Illustrated by Fourteen Wood Engravings |
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Description of the American Electro Magnetic Telegraph: Now in Operation ... Alfred Vail No preview available - 2017 |
Description of the American Electro Magnetic Telegraph: Now in Operation ... Alfred Vail No preview available - 2016 |
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A B C D E F G H I J K L M N O P Q R S action ALFRED VAIL armature arrangement arrow brass spring brass standard break broken circuit is closed clock constructed copper plate diagram distant station east wire Electro Magnetic Telegraph exhibits F and F figure 14 figure 9 friction wheel galvanic battery galvanic current galvanic fluid glass tumbler H and H indentations iron prongs key or correspondent lever will remain magnet is secured magnet or register manner mercury cup motion and stopped nitric acid pass pen lever platinum plate porous cup present prevent a metallic proceed to describe projecting arm pulley put in motion roll of paper side single touch soft iron soldered steel pen points steel roller sulphuric acid supplied with paper telegraphic characters telegraphic purposes thence tion transmitting V W X Y Z west wire whole zinc arm zinc cylinder کیا
Popular passages
Page 18 - ... contact has been made and broken. It has made the iron of the electro magnet a magnet; which has attracted to it the armature of the pen lever ; the pen lever, by its steel pen points, has indented the paper, and the pen lever has, also, by the connecting wire with the break, taken it from...
Page 19 - ... have supplied the pen with paper. But, as only one touch of the key has been made, the clock work soon stops again, if no other touches are made, by the action of the break upon the friction wheel.
Page 6 - After the wire is covered, it ie then saturated with shellac, and then, again, with a composition of asphaltum, beeswax, resin and linseed oil.