Compasses
Compasses are used to draw circles and arcs. However, using a compass can be time-consuming. Use a template, whenever possible, to make circles or arcs more quickly. A compass is especially useful for large circles.
There are several basic types of compasses; however, a bow compass, is used for most drawing applications. Beam compasses consist of a bar with an adjustable needle, and a pencil or pen attachment for swinging large arcs or circles. Also available is a beam that in adaptable to the bow compass. Such an adapter works only on bow compasses that have a removable leg.