This is merely a blunt piece of steel for driving the heads of hammered nails below the surface of the wood.
Compasses are used both for measuring and for scribing circles or parts of them. To prevent them opening or closing when in use an arm or wing is fixed to one leg, and projects through the other, in which is a screw by means of which they can be fixed at any opening. A pair of wing compasses is shown in Fig. 35.
Fig. 35 - Wing Compasses.