• Add to Collection
  • About


    Measure Without a ruler

Ruler compass

Measure Without a ruler
the existing campass couldn`t draw a circle of wanted size 
without a ruler. as well, one must have drawn a circle by measuring 
with a ruler and set the wanted size whenever you drew a circle. 
Ruler compass can draw a wanted size circle easily without measuring 
the size with a ruler every time.

you need a ruler to use a compass we can`t draw 
a circle with wanted size of radius 

1. When you move a leg of the 
compass, the gradation will revolve 
to show the radius.

2. When you move a leg of the copass, the 
gear connected with the leg of the compass 
will express the radius by moving the center