64 



LEATHER BELTING 



Belting is to weigh as follows: Single belts, all sizes, 16 oz. 

 per square foot; double belts: i to 2 in. wide, 26 oz. per 

 square foot; i\ to 4 in. wide, 28 oz. per square foot; 4! to 

 5^ in. wide, 30 oz. per square foot; 6 in. wide and over, 32 

 oz. per square foot. 



Rawhide Lacing. Only hand-cut green slaughter-house 

 hides are to be used for lacing. They are to be cut in the 

 following sizes: \, i 5 ff , f , T 7 5, \, f and f in. They must be 

 cut lengthwise from the hide and have a tensile strength of 

 not less than 



Weight and Thickness of Belting. Samuel Webber in 

 the American Machinist, May u, 1909, published notes on 

 leather belting, from which the following figures of the weight 

 and thickness of the different classes of belting are abstracted : 



Good oak-tanned leather belting from the back of the hide 

 is stated to weigh almost exactly i oz. avoirdupois for each 

 TOTT in. of thickness in a piece of leather i ft. square. 



Belt Dressing. The use of a belt dressing is to increase 

 the coefficient of friction of a belt and thus enable it to 

 pi. 11 a heavier load with a given tension. The dressing 

 should be applied only when the belt slips during working 

 hours and it is impracticable to tighten it before the shop 

 shuts down for the day or the noon recess. Belts which are 

 regularly inspected and whose tensions are maintained accord- 

 ing to the rules given in the chapters on horsepower of belts 

 and belt maintenance will seldom slip, and need no dressing 

 except the regular cleaning and greasing every five or six 



