Workshop tip: Make a beam compass from widespread provides

Needing a drawing software for very massive arcs, I discovered a method to make a beam compass from two widespread compasses and a yardstick. After attaching the drawing compass in tough place, you’ll be able to modify its pencil leg to fine-tune the scale of the arc. Clamp the compasses to an extended stick, and there’s no restrict on measurement.

—WAYNE RALLEY, Phoenix, Ariz.

Illustrations by Dan Thornton
From Tremendous Woodworking challenge #298