CRUSHING AND PULVERIZING MACHINERY. 



445 



Straight belts from any shafting, either directly above or beneath, 

 or at any angle from the mill, are run to the pulleys at each end of the 

 shaft of the driven roll, the speed required being 180 to 200 revolutions 

 for the driving-pulleys. No quartered belts are needed. 



Height of mill over all 6 ft. 6 ins. 



.Width of mill over all 6 " 



Length of mill over all 6 " 6 " 



Distance from floor to center of driving-pulleys . 2 ' ' 9 " 



Weight, complete 7500 Ibs. 



Pulley speed 180 to 200 rev. per min. 



Power required (according to fineness and ma- 

 terial) from 15 to 35 H.P. 



Diameter of pulleys 30 or 36 ins. 



Width of belts 8 ins. 



Diameter of rolls 14 " 



Diameter of ring (inside) 36 " 



Width of contact surface on rolls and ring. ... 7 " 



Weight of ring 800 Ibs. 



Pressure of each passive roll against ring to 20,000 Ibs. 



Pressure of driven roll against ring. 1000 ' ' 21,000 ' ' 



LIST PRICES. 



Style F "Mining" Mill, complete, f.o.b., N. Y $2500 



" ' ' ' ' " with separator and 30-foot elevator. . . 3000 



" ' ' " " crusher, separator and 30-foot elevator 3500 



For the following data on the performance of the Kent mill when 

 handling cement clinker in actual practice the writer is indebted to 

 Prof. S. B. Newberry: 



Working as an intermediate reducer on clinker, taking it from the 

 kilns and grinding it to 20-mesh, the Kent mill has given as high as 50 

 barrels per hour, taking 24 H.P. in doing so. Repairs may aggregate 

 $180 per year per mill. The following table shows the results of several 

 sieve tests of the product from a Kent mill used in this way at a time 

 when it was giving 43 barrels cement per hour. 



When used as a one-stage pulverizer, taking clinker from the kilns 

 and reducing it to finished cement, a 60-mesh screen being used on 

 the Columbian separator, the Kent mill gave a product of 11.6 barrels 

 cement per hour. A sieve test of this product showed that 97.7 per 





