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Education Department Bulletin 



Published fortnightly by the University of the State of New York 



Entered as second-class matter June 24, 1908, at the Post Office at Albany, N. Y., 



under the act of July 16, 1894 



ALBANY, N. Y 



October i, 1910 



New York State Museum 



John M. Clarke, Director 

 Museum Bulletin 143 



GYPSUM DEPOSITS OF NEW YORK 



BY 



D. H. NEWLAND 



AND 



HENRY LEIGHTON 



PAGE 



Introduction 5 



History of the gypsum industry 



in New York 6 



Composition and characters of 



gypsum .... 8 



Uses of gypsum 11 



General geology 15 



Details of the distribution of gyp- 

 sum in New York 26 



Character of the gypsum in New 

 York; chemical analyses 59 



P.\GE 



Permanence of the gypsum supply 61 

 Methods of prospecting and ex- 

 ploiting the gypsum deposits. . 61 



Origin of gypsum 64 



Properties of gypsum, and theory 



of its transformation to plasters. 71 



Technology of gypsum plasters. . 79 



Bibliography 89 



Index Qi 





ALBANY , OCT 20 19 JO 



UNIVERSITY OF THE STATE OF NEW YOrV A, 2, j A R" A A- 



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