260 
CEMENT MATERIALS AND INDUSTRY. 
[HILL. 243. '! 
ocatecl at 
The Portland plant of the Catskill Cement Company, located ai 
Smiths Landing, Greene County, was erected in 1899 and shipments 
were commenced in July, 1900. The materials used are clay from the 
river terraces and limestone of Helderberg age. A bucket cableway 
is used to transport the raw materials from the quarry and clay ban 
to the works. The following average analyses of these materials we 
furnished by the company: 
Analyses of limestone and clay used by Catskill Cement Company. 
Silica (Si0 2 ) 
Alumina (A1 2 3 ) 
Iron oxide (Fe 2 Os) 
Lime (CaO) 
Magnesia (MgO) 
Alkalies 
Sulphur trioxide (S0 3 ) 
The limestone is dried and then reduced in a Smidth 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 reduction are com 
pleted in Davidsen tube mills. Two rotary kilns are in operation 
having a total capacity of about 300 barrels a day. The clinker I 
crushed in ball mills and receives its final reduction in tube mills. The 
cement is marketed as the iw Catskill " brand. The following anatyses 
of the finished product were furnished by the company, 1 and 2 having 
been made in their laboratory, while 3 was made by H. E. Keifer: 
Analyses of cement made by Cat skill Cement Company. 
•i 
Silica (Si0 2 ) 
Alumina ( A1 2 3 ) 
Iron oxide (Fe 2 3 ) 
Lime (CaO) 
Magnesia (MgO) 
Sulphur trioxide (S0 3 ) 
1 
2 
22.48 
21.94 
6.52 
6.02 
4.46 
4.38 
62.93 
64.62 
1.48 
1.25 
1.30 
1.12 
23. 4 
6.3 
3.9 
63.2 
1.1 
1.2 
: 
The plant of the Cayuga Portland Cement Company is located a 
Portland Point, Tompkins County, on the east shore of Cayuga Lake 
The materials used are the Tully limestone and shales of the underlj; 
ing Hamilton group. 
