tumbling drum
A device designed to test aspects of a binding. It
consists of a revolving octagon-shaped drum
equipped with a pocket that lifts the book to the
top of the drum and lets it free-fall (about 2
feet) to strike the lower sides. The number of
impacts required to produce failure of the joints
is recorded. The tumbling drum was developed by
the United States Testing Company. See also: UNIVERSAL BOOK TESTER
.
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