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parallel ruler

   Also found in: Encyclopedia, Wikipedia 0.01 sec.
parallel ruler
n
(Engineering / General Engineering) 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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You then place your parallel ruler so that one part lies along the plotted line and the other part lies over the compass rose on the chart.
I come from a long-line of low-tech folk: my grandfather, a master bricklayer, had to construct with straight edge and compass, and then build all the frameworks for the arches he built around Sydney; my father, a navigator in the navy, used a parallel ruler and set square (oh, and log tables); yet, I am increasingly intrigued by the possibilities opened up by electronic technology--in particular, by the way that the technology allows us to play
They have built in parallel rulers, protractors and precalibrated scales.
 
 
 
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