parallel rulers(redirected from Parallel ruler)
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parallel rulers[′par·ə‚lel ′rü·lərz]
An instrument for transferring a line parallel to itself; in its most common form it consists essentially of two parallel bars or rulers connected in such manner that when one is held in place, the other may be moved, remaining parallel to its original position.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.