. Modern magic. : A practical treatise on the art of arbon (or some-times two plates of carbon) immersedin an exciting fluid, consisting of twoounces and a half of bichromate ofpotash dissolved in a pint of water, withthe addition of one-third of an ounce ofsulphuric acid. The bottle is only filledto the top of the spherical portion, andthe zinc is so arranged that it can bedrawn up into the neck, and so out ofthe solution, when it is desired to sus-pend the action of the battery. The wires for conducting the cur-rent should be of copper covered with silk or cotton, and one of them
. Modern magic. : A practical treatise on the art of arbon (or some-times two plates of carbon) immersedin an exciting fluid, consisting of twoounces and a half of bichromate ofpotash dissolved in a pint of water, withthe addition of one-third of an ounce ofsulphuric acid. The bottle is only filledto the top of the spherical portion, andthe zinc is so arranged that it can bedrawn up into the neck, and so out ofthe solution, when it is desired to sus-pend the action of the battery. The wires for conducting the cur-rent should be of copper covered with silk or cotton, and one of them must be connected with the zinc plate,and the other with the carbon plate ofthe battery, which has binding screwsaffixed for this purpose. For the pur-pose of instantly completing or discon-necting the electric circuit, the wires areFig. 303. affixed to the opposite sides of what is called a connecting stud (see Fig. 303),being a circular disc of wood or porcelain, with a moveable stud orbutton in the centre. On pressing this stud with the finger, the ends it. Fig. 302.
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License: Licensed
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Keywords: ., bookcentury1800, bookdecade1880, bookpublisherlondon, bookyear188
