yardstick compass

yardstick compass

[′yärd‚stik ‚käm·pəs]
(graphic arts)
A simple arrangement consisting of two fully adjustable clips that slide on an ordinary yardstick; one clip has a sharp point, the other a pencil holder; the compass is used to make large, accurate circles.
References in periodicals archive ?
use a Yardstick Compass to mark a perfect curved line.