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The Artificial Balloon








Take a bladder containing only a small quantity of air, and a piece of
lead to it, sufficient to sink it, if immersed in water. Put this
apparatus into a jar of water, and place the whole under a receiver.
Then exhaust the air, and the bladder will expand, become a balloon
lighter than the fluid in which it floats, and ascend, carrying the
weight with it.





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