260 



CEMENTS, LIMES, AND PLASTERS. 



TABLE 120. 

 ANALYSES OF NATURAL CEMENTS, SHEPHERDSTOWN-ANTIETAM DISTRICT, W. VA.-MD. 



1. Shepherdstown, W. Va. Quoted by Cummings. "American Cements", p 35. 



2. Shepherdstown, W. Va. C. Richardson, analyst. Brickbuilder, vol. 6, p. 229. 



3. Antietam, Md. C. Richardson, analyst. Brickbuilder, vol. 6, p. 229. 



Wisconsin. The Milwaukee cements are of quite low index, rang- 

 ing from 1.10 to 1.20, and carry a little more magnesia than do the 

 Rosendale products. 



TABLE 121. 

 ANALYSES OF NATURAL CEMENTS, MILWAUKEE DISTRICT, Wis. 



1. Quoted by Cummings. "American Cements", p. 35. 



2. C. Richardson, analyst. Brickbuilder, vol. 6, p. 229. 



Belgium. The manufacture and character of the Belgian natural 

 cements have been described in detail on preceding pages. As marketed 

 they are usually cements of low index (1.05 to 1.15) and carry small 

 percentages of magnesia. 



England. English natural cements are commonly products of high 

 index, carrying much clayey matter, and often containing remarkably 

 high percentages of iron oxide. 



France. The analyses given in Table 124 represent a peculiarly 

 homogeneous group of natural cements, a fact which is brought out 

 clearly when their Cementation Indexes are calculated and compared. 



