A large compass is utilized to draw circles or arcs of circle in ink or pencil. It consists of two legs, one along with a detachable needle and the second leg such may have not same attachments. The attachments normally utilized are as:
(a) Pencil-point (b) pin-point (c) ink-point (d) lengthening bar.
Therefore, it can perform triple services, like dividers, a pencil compass and a pen compass. A circle of roughly like 12 cm diameter can be drawn along with the pencil or ink-point through the legs of the compass remained straight. To draw bigger diameter circles, the lengthening bar can be required as shown in as:
For drawing small arcs and circles, a small spring bow pencil compass is used. It is equipped along with a centre or side wheel to get finer adjustments. A bow pen compass as displayed in, same to a bow spring pencil compass, is used to draw circles and arcs in ink.