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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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Examples from the Web for parallel rulers
Historical Examples
  • Field's parallel rulers are made in two forms, one rolling and the other sliding.

    Nautical Charts G. R. Putnam
  • 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.

  • It is just as accurate, too, if you lay the distances off carefully with the dividers and parallel rulers.

    Lectures in Navigation Ernest Gallaudet Draper
  • Captain Ponsberry said no more, but threw down his parallel rulers and his pencil.

    At the Fall of Port Arthur Edward Stratemeyer
  • The parallel rulers need no explanation except for the way in which they are used on a chart.

    Lectures in Navigation Ernest Gallaudet Draper

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