A B C OF THE STEEL SQUARE 



117 



When rails are cut by handsaw on bed blocks, 

 bevels are not necessary, as they can always be 

 o'btained by applying a bevel as shown at Fig. 

 80. The stock should lie solid on the block and 

 >quare off the sides. When the block is thin it 

 is best to apply the bevel near the corner, when 

 a greater surface is obtained. These bevels are 

 applied after the joint is squared off the tangent 

 lines. To demonstrate a rail with .unequal 

 pitches, cut another piece of stuff 2x2 inches, 

 as shown in Fig. 79, repeat the process with the 

 cardboard as before. It will be found that the 

 horizontal trace has departed from the angle of 

 45 degrees (see Fig. 79) and has approached 

 nearer one corner and gone farther away on the 

 other. The major axis B will have done like- 

 \\JM-. as it is always square off the horizontal 

 trace C. The wreath having two pitches, the 

 face mold will obviously be wider at one end 

 than .at the other ; and if bevels arc required, 

 they must be set off on the face of each side of 

 the block. The width of the face mold is to be 

 applied on the tangent line ; this makes it 

 slightly in excess on the joint, but it is better 

 to have a little margin in thickness for working. 

 Where thickness of stuff is a secondary consid- 

 eration, it is preferable to take the rail out of 

 stuff which is as thick as the diameter of a circle 



