Beam compass
（重定向自Circle cutter）
![Keuffel & Esser Arrow Beam Compass Set for Drafting.](/Images/godic/202501/04/Beam_Compass5448.jpg")
![sharp point used to score a fine line in the birch plywood connected to each other by a piece of 3/4](/Images/godic/202501/04/Trammel_points_woodshop5448.jpg")
![Circle cutter used to score drywall.](/Images/godic/202501/04/Circle_cutter_J5448.jpg")
A beam compass is a compass with a beam and sliding sockets or cursors for drawing and dividing circles larger than those made by a regular pair of compasses. The instrument can be as a whole, or made on the spot with individual sockets (called trammel points) and any suitable beam.