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Hydrostatic Glass
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Hydrostatic Glass is a classic magic effect where a liquid filled container does not pour out when turned upside down.
Named after the hydraulic principle of Hydrostatic pressure, it was a parlor trick that described in A Brief and Pleasant Treatise (1851) using paper and a bottle.[1] Hoffmann attributes the use of a transparent cover to J. M. Hartz.
It was a pet effect of John Booth in 1941, using a routine development by Howard Huntington, and later Alan Shaxon in the 1980s.