parallel rulers

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.

1695–1705 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Parallel rulers are two rulers connected by linkages that keep their edges parallel.
Bronte brought his charts, parallel rulers, dividers and other navigation aids.
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