58 



LEATHER BELTING 



worked over to one side of the belt, back to the opposite side, 

 and is finally brought to the center at the point at which it 

 started. The lacing is carried out according to the diagram, 

 Figs. 13 and 14. The lacing is parallel to the sides of the 

 belt on the face next to the pulley and crossed on the 



fr 



Pulley Side 

 FlG. 13. 



Opposite Side 

 FlG. 14. 



METHOD OF LACING A BELT. 



opposite side. The following taljle was published by A. D. 

 Porter in the Railway Age Gazette, November 4, 1910, and 

 shows the size of lacing and the punching of the holes for 

 lacing various sizes of belts. 



The strength of a laced joint is about one-half that of the 

 belt itself, or about 1000 to 1500 Ib. per square inch. The 

 working strain allowed on the driving side of the joint was 

 generally taken by early authorities on belting as one-third 

 of the ultimate strength, and this formed the basis of the ten- 

 sion in the belt for the old rules for horsepower. Inasmuch 

 as the working tension in the belt recommended by later 

 authorities, as Taylor and Barth, is considerably lower than 



