866 NEW YORK STATE MUSEUM 



in operation. The final grinding was accomplished with David- 

 sen tube mills, two being in use. 



The cement manufactured by this company was marked as 

 the " Empire " and " Flint " brands. The superintendent of the 

 company stated that the difference between the two brands lies 

 in the fact that the Empire was made from specially selected 

 clean clinker, while in the case of Flint no selection was made, 

 the whole product of the kiln being allowed to go to the grinding 

 machinery. 



Analyses of the Empire brand follow: 1 is quoted by Cum- 

 mings,^ 2 by Lewis/ while 3 was furnished directly by the com- 

 pany: ^ 



1 2 3 



SiO^ 20.8 22.04 21.98 



Al^O,. T.39 6.45 8.2 



FrgOg 2.61 3.41 3.T 



CaO 64 60.92 61.83 



MgO 3.53 1.43 



Alkalis / ..... .84 



0, 2.T3 1.18 



Sr 



3 



During 1901 this plant was entirely remodeled, the new ma- 

 chinery being installed by the Bonnot co., of Canton (0.). Five 

 6 X 60 foot rotary kilns are now in use, each kiln being equipped 

 with a separate feed pump. The materials are prepared for burn- 

 ing by passing through pug mills, emery mills, settling vats, tube 

 mills and storage tanks, from which last the slurry goes to the 

 rotaries. The fuel used is coal, powdered in a Raymond pul- 

 verizer. A detailed description of the new plant will be given, 

 in the near future, in a technical journal. 



Glens Falls Portland cement co. In 1893 this company com- 

 menced the erection of a plant at Glens Falls, Warren co., and 

 their cement was put on the market in 1894, as the Iron Clad 

 braud. Six shaft kilns of the Schofer type were installed, the 



1 American cements, p. 36, 

 2Min. ind. 6: 99. 



