Beam Compasses

Solves the problem of making perfect large circles up to 36" in diameter. This beam compass attaches to thin profile yardsticks and automatically shows figures for the radius circumference and area of any circle in inches or centimeters.

Includes two 13" graduated beam bars and one coupling to accommodate circles up to 48" diameter. Inch and metric graduations. Spring-loaded thumbwheel on the top of each slide assembly allows for smooth and precise adjustments. Comes complete with...

Solves the problem of making perfect large circles up to 36" in diameter. This beam compass attaches to thin profile yardsticks and automatically shows figures for the radius circumference and area of any circle in inches or centimeters.

Includes two 13" ungraduated beam bars and one coupling to accommodate circles up to 48" diameter. Spring-loaded thumbwheel on the top of each slide assembly allows for smooth and precise adjustments. Comes complete with interchangeable ruling pen...