Compass is a tool for drawing circles or strings in mathematics and drawing, and is often used for drawing with a ruler.

A compass consists of a pen tip, a rotating shaft, compass legs, a ruler, a hinge, a pen body, a pen tip, a compass tip and small ears, wherein the lower end of the pen tip is inserted into the upper end of the pen body, and the lower end of the pen body is in threaded connection with the upper end of the pen tip; the flush end of the small ear is welded in the middle of the outer side of the compass leg, and the lower end of the compass leg is clamped with the upper end of the compass tip.

Characterized in that one side of the pen body is bonded to one side of the hinge, and the other side of the hinge is bonded to the middle of one end of the ruler; Inserts on both sides of the upper end of the seam of the pen body are located at both ends of the rotating shaft, and the shaft body of the rotating shaft is connected to the upper end of the compass leg through a sleeve.

How to use compasses

1. Measure the distance between the two feet of the compass with a ruler as the radius.

2. Fix the end in one place with a needle as the center of the circle.

3. Turn one end once with a pencil.