proportional dividers[prə′pȯr·shən·əl di′vīd·ərz]
Dividers with two legs, pointed at both ends, and an adjustable pivot; distances measured by the points at one end can be marked off in proportion by the points at the other end.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
A drafting instrument used in reducing or enlarging drawings; consists of two legs whose ends are pointed and cross each other (like the letter X) at a pivot point whose position can be adjusted; the distance between the two pointed ends on one side of the pivot is proportional to the distance between the pointed ends on the opposite side.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.