In the hands of one who knows how to use it the square becomes a simple calculating device of the most wonderful capacity.

There is a filling among carpenters, that one must have a knowledge of higher mathematics in order to be able to use a Steel Square with all its complicated markings, figures and tables.  This is not true.  With its numerous scales and figures there is nothing about it that is complicated.

The understanding of a very few simple rules governing application of this Square will enable the carpenter:

To easy and quickly determine the length of any Common, Hip, Valley or Jack Rafter for any Pitch of Roof.  To make the proper Top and Bottom Cuts as well as Side or Cheek Cuts for any Rafter.