HJ M 



Ifilwai re uniform product and also use less fuel 



AV! drawn from the commonly 



mally burned rock, overburned or clinkered ma- 

 il), and underburni At some works the clink*-: 



y: for, though it much greater 



hardnetfl than the normally bui and requires m 



powerful machii nah it. .-till il - a milch higher 



j th. Three works in tl • pulverize this clinker 



and put it on the market under the name *:>{ Portland cement 



There is usually a track running along the base of the kilns, 



which the car? are brought to r< the calcined stone. 



Th< re then run up to the grinding rooms, where the 



der. Several types of crushers and pul- 

 :. including Gates and Blake crushers. Si adman 

 disinteg Sturtevant Lui>t"iie and emery mills, Cummi: 



pulverizers, etc. 



The burned stone usually goes through a gradual pro ;ess 

 reduction, necessitating the use of machines for . medium 



and tine grinding, and the types used as well as their arrai._ 

 ment is slig *ly different at each works, as will be seen by r< : 

 - tription of the New York indu3try iiiven in sul 

 quent pages. In the natural cement trade there are several 

 -lit per barrel, as follows: RosendaL . ounds 



net; Pennsylvania, 2 et in barrels, 200 pounds net in 



sack-: Western standard, 2<".^ pounds net. 1 



ant roll jaw crusher (pL 8 contains two si 

 jaws with curved faces, pivoted at their lower end. The jaws 



of a i ;_ "int. It i- claimed that this 



crusher t;: ge size and reduc m at one opera- 



ti"i b "avel and Band. A crusher with 6x 16 jaws weigh- 7 



ad requires 10 I er t-> run it. Its capacity i- - 



- an hour oi P rtland clinker, when set t-. \ 



inch openi 



1 Min. iud. G: I 



