46 ABC OF THE STEEL SQUARE 



dicated in Fig. 22. Let it be required to describe 

 a circle, the diameter of which is equal to ED. 

 Drive pins or nails at these points and place the 

 square as shown in the sketch. Place a pencil 

 in the interior angle of the square, as shown at 

 F. Then gradually shift the square so that the 

 pencil will move in the direction of D, always 



MB. 22. 



being careful to keep the inside of the blade and 

 inside of the tongue in contact with the pins or 

 nails, ED. After having described the arc from 

 F to D reverse the direction describing the arc 

 from F to E. Then turn the square over and 

 by similar means complete the other half of the 

 circle. 



