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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
1695-1705 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Historical Examples
  • Hence we find him first making brass scales, parallel-rulers and quadrants.

    James Watt Andrew Carnegie

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