Archimedes spiral compass

So far, the drawing of the spiral still follows the method introduced in the textbook, but this method is very time consuming and does not achieve a satisfactory rendering effect. According to the laws of kinematics, we have designed a new spiral drawing device, such as The figure shows. This device can easily and accurately, save time and effectively draw the Archimedes spiral, and can be installed on ordinary compasses. When you draw the compass, you can quickly draw the spiral.