Word: torsional
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Dates: during 1930-1939
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...demonstrations. Last week it was unharmed after a 2-lb. steel ball and a11-lb. bag of steel shot had been dropped on it from six feet, after a pane of it had been placed on an ice cake and molten lead poured on the top surface, after a torsion machine had warped a sheet of it like so much cardboard...