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Foreword

Among all the tools used by carpenter there is, perhaps, non so useful, simple and indispensible as the modern Steel Square.  There is not a tool that maybe so readily applied to the quick solution of the many difficult problems of laying out work as Steel Square.  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.