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parallel rulers

plural noun
a pair of straightedges connected by two pivoted crosspieces of equal length so as to be parallel at all times, used for various navigational purposes, especially for transferring the bearing of a plotted course to a compass rose.
Origin of parallel rulers
First recorded in 1695-1705 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for parallel ruler
Historical Examples
  • Spreading it on the table he ran his parallel ruler over it.

  • It will be of some interest to teachers to see one of the early forms of this parallel ruler, as shown in the illustration.

    The Teaching of Geometry David Eugene Smith
  • The lieutenant followed him, and stood watching as the master again manipulated his parallel ruler and dividers.

    The Pirate Slaver Harry Collingwood
  • By this process the parallel ruler could be moved all over the chart without losing the course from one point to the other.

    Outward Bound Oliver Optic
  • Mr. Spokesly laid the parallel ruler against the line and produced it clear across the chart.

    Command William McFee
British Dictionary definitions for parallel ruler

parallel ruler

(engineering) a drawing instrument in which two parallel edges are connected so that they remain parallel, although the distance between them can be varied
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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