For his experiments with hydrogen in 1824
"The caoutchouc is exceedingly elastic. Bags made of it...have been expanded by having air forced into them, until the caoutchouc was quite transparent, and when expanded by hydrogen they were so light as to form balloons with considerable ascending power...."
He made them by cutting round two sheets of rubber, coating the inside with flour and laying them together. When he pressed the edges the rubber self-welded. Journal of Science, Arts and Manufacture 1824.
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