anniversary clock(redirected from Torsion pendulum clock)
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anniversary clock[‚an·ə′vərs·ə·rē ‚kläk]
A clock that can run as long as 400 days on a single winding because of a slow torsion pendulum. Also known as four-hundred-day clock.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.