10 ABC OF THE STEEL SQUARE 



of this kind. I have, therefore, only given such 

 examples as will enable any one to apply some 

 one of them to any work in hand. 



In the foregoing sketch I have given a few 

 hints as to the kind of ^quare to purchase when 

 it is necessary to buy; in many cases, however, 

 this book will find its way into the hands of 

 mechanics and others, who will have old and 

 favorite squares in their chests or workshops, 

 and who will not care to dispose of a "well-tried 

 friend" for the purpose of filling its place with 

 another, simply because I have recommended it, 

 To these workmen I would say that I do not 

 advise a change, provided the old square is true, 

 and the inches and sub-divisions are properly 

 and accurately defined. I wish it distinctly 

 understood that old squares, if true, and marked 

 with inches and sub-divisions of inches, will per- 

 form nearly every solution presented in this 

 book. 



The lines and figures formed on the squares 

 of different make, sometimes vary, both as to 

 their position on the square, and their mode of 

 application, but a thorough understanding of 

 the application of the scales and lines shown on 

 any first-class tool, will enable the student to 

 comprehend the use of the lines and figures ex- 

 hibited on other first-class squares. 



