parallel ruler

British  

noun

1. engineering a drawing instrument in which two parallel edges are connected so that they remain parallel, although the distance between them can be varied

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Example Sentences

The same thing occurred on the opposite shore of the Strait, where the projections of Cape Gallant, Cape Holland, and Cape Froward, are in the same line of bearing; so that a parallel ruler placed on the map upon the projecting points of the south shore, extended across, will also touch the headlands of the opposite coast.

From Project Gutenberg

Parallel Ruler of the Seventeenth Century San Giovanni's "Seconda squara mobile," Vicenza, 1686 A somewhat more complicated form of this instrument may also be made by pupils in manual training, as is shown in this illustration from Bion's great treatise.

From Project Gutenberg

It is evident that, unless the workmanship is unusually good, this form of parallel ruler is not as accurate as the common one illustrated above.

From Project Gutenberg

Parallel Ruler of the Eighteenth Century N. Bion's "Traité de la construction ... des instrumens de mathématique," The Hague, 1723 Theorem.

From Project Gutenberg

Mr. Spokesly laid the parallel ruler against the line and produced it clear across the chart.

From Project Gutenberg