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.
Origin of parallel rulers
1Words Nearby parallel rulers
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024
How to use parallel rulers in a sentence
I pricked that place off on the chart with my dividers, and with my parallel rulers found that west-by-south was the true course.
The Cruise of the Snark | Jack LondonCaptain Ponsberry said no more, but threw down his parallel rulers and his pencil.
At the Fall of Port Arthur | Edward StratemeyerThe parallel rulers need no explanation except for the way in which they are used on a chart.
Lectures in Navigation | Ernest Gallaudet DraperIt is just as accurate, too, if you lay the distances off carefully with the dividers and parallel rulers.
Lectures in Navigation | Ernest Gallaudet DraperHence we find him first making brass scales, parallel-rulers and quadrants.
James Watt | Andrew Carnegie
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