Since the diameter of the circle is 14 cm, then its radius is 7 cm, so we can use a pair of compasses
to construct a circle of radius 7 cm (see Figure 6).
Rigaud, Sir William Chambers is distinguished from Joseph Wilton and Sir Joshua Reynolds by having his left hand resting on a pair of compasses
on top of an architectural drawing while in his right hand is a right-angle square.
This hardware featured equally alongside the pair of compasses
and also the necessary slide-rule, as calculators didn't exist.
The art of measurement being the foundation of all painting," he wrote, "I propose to give the elements thereof and to explain its principles to young people wishing to educate themselves in their art, so that they may confidently start measuring with a pair of compasses
and ruler, thereby recognizing and having before their eyes the genuine truth.
He used a pair of compasses
to scratch '666' on his right forearm.
It was originally a Greek word meaning 'goad' or 'sharp point' and was the word used for the point on a pair of compasses
which was placed on a drawing surface as a circle was drawn.
The accuracy, shape, and dimensions of the patterns suggest that the engraver probably used a pair of compasses