Ferris, Richard. [from old catalog] · New York, T. Nelson and sons · leaf 267
bout the same time the French scientist, M.Charles, decided that hydrogen gas would be betterthan hot air to inflate balloons. Finding that thisgas passed readily through paper, he used silk coatedwith a varnish made by dissolving rubber. His bal-loon was 13 feet in diameter, and weighed about20…
Aeronautics
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