148 



NEW YORK STATE MUSEUM 



brought from Niagara Falls. In order to prevent the escape of 

 dust from the ealciner, a stream of water is sprayed on the smoke 

 and dust at the top of the flue, which is turned downward, 

 and as a consequence the coat of plaster of paris, which is so 

 common around other plaste'r mills, is entirely lacking here. 



For some time hollow fireproofing blocks similar to the hollow 

 brick used for partitions in fireproof buildings, were made heTe, 

 but the demand for stucco has been so great that this branch of 

 the industry has been temporarily discontinued. 



Akron. At Akron a shaft has been sunk, and it is expected 

 that gypsum will be mined sho'rtly. Up to the present time, 

 however, nothing has been done. 



Production of gypsum in New York 

 The production of gypsum for New York since 1889, was as 

 follows : 



Year 



Product 



Value 



1889 



52608 short tons 



179476 



1890 



32903 



73093 



1891 



30135 



58571 



1892 



32394 



61100 



1893 



36126 



65392 



1894 



31798 



60262 



1895 



33587 



59321 



1896 



23325 • 



32892 



1897 



33440 " 



78684 



1898 



31655 " 



81969 



1899 



52149 



105533 



1900 



58890 



150588 



1901 



119565 



241669 



1902 



110364 



259170 



1903 



137886 . 



462383 



ANALYSES OF GYPSUM 



The following table of analyses of gypsum is compiled to 

 show the comparative merits of the great deposits of this coun- 

 try. It has been somewhat difficult to obtain satisfactory 

 analyses of New York State gypsum, as few samples have been 



