406 



CEMENTS, LIMES, AND PLASTERS. 



In the article * accompanying this figure, the raw side of the mill is 

 described as follows: 



"Following the course of the material step by step, it will be seen 

 that the loaded cars from the quarry come into the mill at the east 

 end at an elevation of 12 feet above the crusher-room floor, which is itself 



FIG. 85. Plan of plant, Lawrence Cement Co., Siegfried, Pa. 

 (Lathbury and Spackman.) 



elevated 13^ feet above the main mill floor, and that they dump through 

 the track onto the crusher-room floor. Flush with this floor are the 

 tops of three rotary crushers, two for crushing limestone and one for 

 crushing shale. The two limestone crushers are run by a 45-H.P. electric 

 motor and the shale crusher by a 22-H.P. electric motor. From the 

 crushers the stone is delivered, shale and limestone separately, into four 

 rotary driers, each of which is operated by a 5-H.P. electric motor. 

 From the driers the stone passes separately to the ball mills for the 

 first grinding. These ball mills are of the Krupp type, and there are five 

 of them, each operated by a 50-H.P. electric motor. From the ball 



* Engineering News, vol. 50, pp. 70, 71. July 23, 1903. 



