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

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

From Project Gutenberg

Writing; materials for writing; pens; inks; use of coloured inks for denoting numbers; polygraph; telegraph; geometrical instruments; rulers; compasses; flexible rulers; squares; triangular compasses; parallel rulers; Marquois's scales; pantograph; proportional compasses; sector.

From Project Gutenberg

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 Project Gutenberg

They gave him the credit, that he incorporated the subterranean bread-fruit in the ground at quite as symmetrical distances as the chaplain; in fact, both looked sharply after the rectitude of the potato-row, and their eyes were the parallel rulers of the beds.

From Project Gutenberg

Purple with rage, Alten seized a heavy pair of parallel rulers, and before I could check him hurled them full in the operator's face.

From Project Gutenberg