Weems & Plath 545E Beam Compass
The Beam Compass is used for drawing large arcs and circles on big charts. It is made of high quality aluminum alloy and is precision crafted with a 20 inch (508 mm) overall radius when the 13 inch (330 mm) main beam is joined with the 7 inch (178 mm) extension bar. The beam compass is provided with a 7 inch extension bar, a point, stylus, spare leads and velvet lined, impact resistant case. Made in Germany.