Abstract: A compass, comprising a head portion and first and second leg members. Each of the first and second leg members include a first end and a second end, the first end of the first leg member and the first end of the second leg members are rotatably engaged with the head portion at different locations on the head portion. A post member is meshedly engaged with the first end of the first and second leg members, and an adjusting wheel is threadedly engaged with the post member. The rotation of the adjusting member results in a corresponding movement in the post member. The movement of the post member causes a rotation of the first end of the first leg member relative to the second leg member.