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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

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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The exercises were growing more complex and difficult: navigation by leg dividers and a parallel ruler; docking in 30 mph wind; sailing around an entire island; trying to rescue Mick’s hat, which blew overboard.

From Washington Post

By this process the parallel ruler could be moved all over the chart without losing the course from one point to the other.

From Project Gutenberg

I measured off a distance of four miles with the dividers, and marked it off above the mouth of the creek; then applied the parallel ruler and found the course.

From Project Gutenberg

The lieutenant followed him, and stood watching as the master again manipulated his parallel ruler and dividers.

From Project Gutenberg

In his model the double parallel ruler is replaced by two endless strings and pulleys, and the bar, B C, by a T square.

From Project Gutenberg