104 A B C OF THE STEEL SQUARE 



P. McVity, Milwaukee, asks: "How can I 

 draw a circle with the Steel Square?" 



Answer: A circle of any required diameter 

 may be drawn by means of the square by using 

 it as indicated in the accompanying sketch. 

 Drive two pins or nails, A and B, Fig. 68, at 

 whatever distance apart the circle is to have as 

 its diameter. Bring the square against them, 

 as shown, and use a pencil in the angle as indi- 



Fiff. 68. 



oated in the drawing. This rule is very con- 

 venient in many instances. Suppose A and B 

 are two points through which a circle is re- 

 quired to be drawn. By bringing the square 

 against pins or nails placed in the points, it 

 may be described as indicated in the sketch. 



