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parallel rulers

noun
1.
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
1695-1705
1695-1705
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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10
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