864 - NEW YOEK STATE MUSEUl^ 



The swamp from whicli tlie raw materials are ob1;;^ine(l sliows 

 sections, from top to bottom, approximately as follows: .,_ 



, .^,- -^ , " ' Thickness 



Material '-/".■ ^ ' - - ' ' in feet 



Muck ...,/.....,,.;.... 1;,: 2 



Upper bed white marl . 4- - 1 



Lower bed gray to brown marl 4 7 



Sand ..-. , . -, ...... 1 



Bliiisli clay 2 5 



A# might be expected from the relative color of the marls, the 

 material from the lower bed shows, on analysis, more organic 

 matter than th,at from the upper bed, for which reason more of 

 it must be used, with the same amount of clay, than of marl 

 from the upper bed. This distinction is -accompanied by other 

 slight but rather constant differences in chemical composition, 

 which have also to bo taken into account in the preparation of 

 the cement mixture. . _ 



Analyses of the raw materials follow. Those marked 1 and 3 

 are quoted by Cummings,"^ while 2 and 4 were recently furnished 

 me by the company; 



Marl Clay 



1 3 3 



SiO.^ . . .26 .26 40.48 



'^^^^•^ \ .1 -21) 20.95 



FcgOg .....> .Oli 



CaC03 94.39 91.03 25.8 



Mgt'O^ .38 . .4 .99 



K2O 3.14 



SO3 



Organic 1.54 



Water + loss 3.1 



8.5 



It will be noted that the clay used here runs higher in lime 

 than does any other used in the state, the nearest approach to 

 the above analyses being shown by that of the clay used at Way- 

 land, which carries a little less than 20^ of lime carbonate. 



1 American cements, p. 253. 



