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.

---

Etymology

Origin of parallel rulers

First recorded in 1695–1705

Example Sentences

But he always remembered Elizabeth Boardman and the parallel rulers.

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

The instruments used in consulting a chart, i.e., parallel rulers, dividers, etc. have already been described.

From Lectures in Navigation by Draper, Ernest Gallaudet

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

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

The Captain changed his frown for a smile as the situation dawned on him, then, snatching the parallel rulers from the chart-table he began to belabour the most accessible portion of his gurgling subordinate's anatomy.

From H.M.S. —— by Bower, John Graham

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 Dingle, Aylward Edward