“A vacuum airship, also known as a vacuum balloon, is a hypothetical airship that is evacuated rather than filled with a lighter than air gas such as hydrogen or helium. First proposed by Italian monk Francesco Lana de Terzi in 1670, the vacuum balloon would be the ultimate expression of displacement lift power.”

Originally posted by Dane Carlson on April 22, 2014 in Inventions / Why Didn't I Think of That?.

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