S54 NEW YOEK STATE MUSEUM 



material directly to tlie kiln, without preliminary wetting, making 



into bricks and drying. This was the first American plant at 



which this practice of direct charging was followed. 



In 1889 the plant was entirely destroyed by fire, and Portland 



cement manufacture in the lower Hudson valley ceased till 1900. 



The following notes from the Rondout records establish some 

 dates. 



25 Oct. 1888. Burned about 100 barrels today; oil fuel. 

 Oround the limestone and clay separately dry, and mixed before 

 feeding to kiln. Mixture — clay 21 lb, limestone 80 lb. 



25 Feb. 1889. Mixture burned — clay 21 lb, limestone 100 lb. 



ANALYSIS OF RESULTING- CEMENT 



Per cent 



Lime 65.96 



Silica 18 . 53 



Alumina and oxid of iron 11 . 09 



Potash - 12 



Soda :. 62 



Carbonic acid .97 



Magnesia and undetermined 2 . Yl 



" 100 



PHYSICAL TESTS OE TENSILE STEENGTH 



Second tests 



Y days = 253 lb 7 days = 306 lb 



14 ^"^ =466 '' 10 " =509 " 



Representative analyses of the limestone and clay used at tlie 

 Carthage Landing and South Pondout plants are as follows: 



Limestone Clay 



Per cent Per cent 



Lime 52.295 1.255 



Magnesia. .5 , 2 . 37 



Peroxid iron .438 9 . 144 



Alumina . 677 " 20 . 771 



Silica 4.405 54.011 



Carbonic acid 41 . 515 .4 



Water and alkalis .17 12 . 049 



100 100 



