parallel rulers

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parallel rulers

[′par·ə‚lel ′rü·lərz]
(graphic arts)
An instrument for transferring a line parallel to itself; in its most common form it consists essentially of two parallel bars or rulers connected in such manner that when one is held in place, the other may be moved, remaining parallel to its original position.
References in periodicals archive ?
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!