,v rOBK STATE MUSEUM 



the kiln, witlmut preliminary wetting, making 

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

 which tlii- practii charging was followed. 



be plant was entirely destroyed by fire, and Portland 



tent manufacture in the lower Eudaou valley ceased till 1900. 



The following uotes from the Rondout records establish some 



L888, Burned about 100 barrels today; oil fuel, 

 •und the limestone and clay separately dry, and mixed before 

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



'. Mixture burned — clay 21 lb, limestone 100 lb. 



ANALYSIS OF RESULTING CEMENT 



Percent 



Lime 65.96 



Silica 18.53 



Alumina and oxid of iron 11.09 



Potash 12 



Soda 62 



Carbonic acid .97 



Magnesia and undetermined 2.71 



100 



PHYSICAL TESTS OF TENSILE STRENGTH 



Second tests 



7 days = 253 lb 7 days = 306 lb 



14 " =466 " 10 " =509 " 



Representative analyses of the limestone and clay used at the 

 Carthage Landing and South Rondout plants are as follows: 



Tame 



aesia 



Peroxid iron .... 



Alumina 



Silica 



Carbonic acid . . . 

 ter an<l alkalis 



LlMKST )VE 



Per cent 



Clay 

 Per cent 



52.295 



1.255 



.5 



. 2.37 



.438 



9.144 



.677 



20.771 



4.405 



54.011 



41.515 



.4 



.17 



12.049 



100 100 



