This device is used to determine the diameter of a piece of wire. It consists of a U-shaped frame. This frame is attached to a hollow cylinder. A scale graduated in millimeters is marked on the cylinder along its length. This is called pitch scale. A screw is working through the hollow cylinder. The tip of the screw is plane. The other end of the screw is attached to a fine sleeve with a beveled edge. This is called head scale. The pitch of the screw is the distance moved by the tip of the screw for one complete rotation of the screw head.
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