Rolling Ruler

Technical

A rolling ruler is a ruler that contains a cylinder much like a rolling pin inside, thereby enabling it to "roll" along a sheet of paper or other surface where it is being used. A rolling ruler can draw straight, parallel lines, and also has other instruments included, enabling it to do the jobs of a protractor and compass.

Tags:

rolling , ruler , rolling ruler , roller scale , scale , cylinder , rolling , pin , roll , paper , sheet , draw , drawing , straight , parallel , line , lines , instrument