72 



MECHANICS 



under the same conditions. Accordingly, the width of a double 

 leather belt required for any service is only T^ that of a single 

 belt for the same service. 



Lacing of Belts. A very satisfactory way of lacing belts 

 less than 3 in. wide is shown in Fig. 1, in which A is the outside 

 of the belt and B is the side that runs against the face of the 

 pulley. The ends of the belt are first cut square, and then 

 holes are punched in the ends, in corresponding positions 

 opposite one another. The number of holes in each row 

 should always be odd, in the style of lacing shown, using 3 

 holes in belts up to 2 in. wide and 5 holes in belts between 

 2 and 3 in. wide. The lacing is first drawn through one of 

 the middle holes from the under side, or pulley side, as at 1. 

 Then it is drawn across the upper side and is passed down 

 through 2, across under the belt to 3, up through 3, across and 

 down again through 2, back under the belt and up through 3 

 again, then across and down through 4 and finally up through 

 5, where a barb is cut in the edge of the lacing to prevent it 

 from pulling out. This completes the lacing of one half. 

 The other end of the lacing is then carried through the holes 

 in the other half, in the same order. 



tt \N\V\\\V 



FIG. 1 



FIG. 2 



For belts wider than 3 in., the lacing shown in Fig. 2 may be 

 used. In this case, there are two rows of holes in each end of 

 the belt to be joined. The row nearer the end of the belt should 

 have one more hole than the row farther away. For belts 

 up to 4} in. wide, use 3 holes in the first row and 2 holes in 

 the second row. For belts up to 6 in. wide, use 4 and 3 holes, 

 respectively. For wider belts, make the total number of holes 



