empip said:You do not want the 'safety compass' type.
Ever tried a cheap as chips PVC coated, lead/steel core, flexible curve?
Beam compasses..
Bought my Jakar spring-bow (etc) set many decades ago - remain in excellent condition.
http://www.jakar.co.uk/drawing.html
Pray tell me how these are going to help me scribe two bits of skirting together in a corner, or a piece of laminate to fit around some pipework?