MIXTURES OF TWO GRADES. 



The relation borne by the traction of mix- 

 tures to the traction of separate grades is most 

 clearly shown by the records from varied 

 combinations of two grades only. In all 

 experiments with mixtures the same width of 

 channel, 1 foot, was used; and from the ad- 



justed capacities for mixtures of two it is 

 possible to select a full set associated with the 

 same discharge, 0.363 ft. 3 /sec., and the same 

 slope, 1.4 per cent. These capacities are 

 arranged for comparative examination in 

 Table 61, and to them are added, from Table 

 12, the corresponding capacities for the separ- 

 ate grades. 



TABLE 61. Capacities for traction, with varied mixtures of two grades. 



