62 A B C OF THE STEEL SQUARE 



figures immediately to the right represent the 

 length of the brace or the hypothenuse. For 

 instance, the figures 36-36 59-91 show that the 

 run on the post and beam is 36 inches, and the 

 length of the brace is 50.91 inches. 



Upon some squares will be found brace meas- 

 urements given where the run is not equal, as 

 18-24 30. It will be noticed that the last set of 

 figures are each just three times those mentioned 

 in the set that are usually used in squaring a 

 building. So if the student or mechanic will fix 

 in his mind the measurements of a few runs, 

 with the length of braces, he can readily work 

 almost any length required. 



Take a run, for instance, of 9 inches on the 

 beam and 12 inches on the post. The length of 

 brace is 15 inches. A run, therefore, of 2, 3, 20, 

 or any other number of times the above figures, 

 the length of the brace will bear the same pro- 

 portion to the run as the multiple used. Thus. 

 if you multiply all the figures by 4 you will have 

 36 and 48 inches for the run, and 60 inches for 

 the brace, or to remember still more easily, 3, 4 

 and 5 feet, or 6, 8 and 10 feet. 



There are other runs that are just as easily 

 fixed in the mind. 51 -inch run, brace 6 feet, 

 12 hundredths of an inch ; 8 feet, 3-inch run, 

 brace 11 feet, 8 inches, etc. 



