parallel rulers

American  

plural 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.

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Etymology

Origin of parallel rulers

First recorded in 1695–1705

Example Sentences

See Examples For:

parallel rulers

But he always remembered Elizabeth Boardman and the parallel rulers.

From "Carry On, Mr. Bowditch" by Jean Lee Latham

Fosterdyke, busy with parallel rulers and compass was bending over a chart.

From The Airship "Golden Hind" by Percy F. (Percy Francis) Westerman

I crossed the Channel on the 29th of July 1863, embarrassed by the possession of two ladders, each twelve feet long, which joined together like those used by firemen, and shut up like parallel rulers.

From The Ascent of the Matterhorn by Edward Whymper

He entered the cabin that had been used as a chart room and rummaged the desk for parallel rulers and dividers; but a soft step behind him brought him to a stand quickly.

From Gold Out of Celebes by Aylward Edward Dingle

Parallel Rulers The parallel rulers need no explanation except for the way in which they are used on a chart.

From Lectures in Navigation by Ernest Gallaudet Draper