H m: 



Tip iron, and consist of a frustum of a solid 



atrically within the inverted 

 fn: . both having on their adjacent surfaces 



for breaking the si - it passes 



d them. From the crackers the crushed cement is 



! by mi ;' an elevator and conveyor to a sieve 11 feet 



nd 10 i and about 50 meshes per inch. 25# to 



That which does not pass the sieve goes 



izontal it is ground between millstones, 



BT which the two lots of hue material are mixed, and then 



ked in barrels for shipment. 



Akron district 

 One of the largest plants in the state is situated at this locality, 

 viz the Cummings cement co. (pi. 80, 81); another large works 

 also near this town is the Union Akron cement co. (pi. 82, 83). 



The Cummings cement company has 575 acres of land, and 

 the cement bed is from 7 to 8 feet thick. The beds differ from 

 those at Rosendale in lying almost horizontally. The kilns are 

 34 feet high, eight of them being of rectangular cross-section, 

 9x22 feet in dimensions, and nine of them round, with a diameter 

 of 9 feet. During the calcination much of the cement rock be- 

 comes clinkered, and is separated and groimd by itself to be sold 

 as Portland cement. 



At this works a general system of reduction is used, consisting 

 of 1) Sturtevant crushers; 2) Cummings pulverizers; 3) 10 run 

 of 42 inch underrunner millstones faced with chilled iron plates; 

 4) 10 run of 42 inch hard Esopus underrunner millstones. 



'-Hi' . - it is conveyed from one to another of these 



of crushers, La made to pass over screens, whereby such 



materia] as has been reduced to proper fineness is separated from 



>nted to a general conveyor, which finally re- 



the material from all the grinding machines and conveys 



it U house. Each set of crushers, while it furnishes a 



part of th< rial, reduces the sizes of the unground portion 



that th< rial which is fed to the fourth 



