134 



ABC OF THE STEEL SQUARE 



inside and center line of same, showing also the 

 joints. Set out the pitch off the shank; square 

 up the center outside and inside lines from the 

 plan on to the pitch. The thickness of th<* 

 wreath piece is found by drawing a section of 

 rail under the pitch line B. Se ! out again the* 

 half-width of the well; square off the pitch lines 

 to the half width; this gives major and minor 



Fig. 94. 



axes of the ellipse, as shown in the development 

 (Fig. 94). Lay the square on the axis. Get 

 a light piece of lath, drive in a nail at the half 

 major, and one at the half minor; describe the 

 inner ellipse line on the piece of timber from 

 which the wreath is to be formed; pull out the 

 nails, and repeat the process for the center and 

 outside lines. Draw the shank and also the point 



