862 KEW YOEK STATE MUSEUM 



Catskill cement co. The Portland plant of tlie Catskill cement 

 CO., located at Smiths Landing, Greene CO., was erectei^ during 

 1899, and shipments were commenced in July 1900. The materials 

 used are clay, from the river terraces, and limestone of Lower 

 Helderberg age. A bucket cableway is used to transport the raw 

 materials from the quarry and claybank to the works. Average 

 analyses of these materials, furnished by the company, follow: 



Limestone CI y 



per cent ] ev ce.itt 



SiOg 1.54 61.92 



Ai^Og. .39 16.58 



Fb^Os 1-04: Y.84 



CaO 53.87 . 2.01 



MgO.. 52 1.58 



Alkalis . 3 . 64 



SO3 tr. 



The limestone is dried and then reduced in a Krupp ball mill. 

 The clay is passed through a roll disintegrator and is dried. The 

 materials are, at this stage, mixed dry; and the mixing and re- 

 duction completed in Krupp tube mills. Two rotary kilns are in 

 operation, having a total capacity of about 300 bai'rels a day. 

 The clinker is crushed in Krupp ball mills, and receives its final 

 reduction in Krupp tube mills. The cement is marketed as the 

 " Catskill '' brand. Analyses of the finished product follow. All 

 were furnished by the company, 1 and 2 having been made in 

 their laboratory; wliile 3 was made by H. E. Keifer Ph.D. 



1 » 3 



SiOg :.. 22.48 21.94 23.44 



AI2O3 6.52 6.02 6.35 



FegUg 4.46 4.38 _ 3.99 



CaO 62.93 64.62 .63.21 



MgO 1.48 1.25 , 1.15 



^ . I •■ > > i 



^y 



