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The Electric Balloon

Two balloons, made of the allantoides of a calf, are to be filled with

hydrogen gas, of which each contains about two cubic feet. To each of

these is to be suspended, by a silken thread about eight feet long,

such a weight as is just sufficient to prevent it from rising higher

in the air; they are connected, the one with the positive, the other

with the negative conductor, by small wires about 30 feet in length;

and being kept nearly 20 feet asunder, are placed as far from the

machine as the length of the wires will admit. On being electrified,

these balloons will rise up in the air as high as the wire will allow,

attracting each other, and uniting as it were into one cloud, gently