Beam Compass by Alvin 961X Graduated Beam Compass

Beam Compass Alvin the 961X Alvin beam compass features two 13" graduated beam compass bars create circles up to 48" diameter. The Alvin beam compass is graduated in millimeters on the top, inches on the bottom to make it easy to draw circles and ellipses to the desired size. The beam compass by Alvin has interchangeable ruling pen, pencil and divider legs included. The beam compass also includes a small tube with spare leads and needlepoint. Comes complete with case Alvin graduated beam compass.