128 



ABC OF THE STEEL SQUARE 



ridge has been deducted from the side cut. The 

 side cut is found in a slightly ^different way from 

 that of a regular hip or valley on an ordinary 

 roof. The common method is to take the length 

 of the hip on the blade and run on the tongue, 

 but this will not work in this case, as the run 

 of the hip does not be at an angle of 4.5 degree- 

 as in ordinary roofs. The line B J in Fig. 86, 



Fig. 89. 



must first be obtained, as shown in Fig. 89. 

 Joint one edge of a board and square up the 

 line B L. Measure one-half the width of build- 

 ing in inches on this line, 12 in this case, and 

 with the heel of the square at the point B, 

 move the square until 20 on the blade touches 

 the edge of the board at E. The tongue will 

 then give the point J 15 inches ; which is the 

 length o f A V.e line required. Then take tlm line 



