CKEL.] 
NATURAL CEMENT LITERATURE. 
355 
)lants are located north of Milwaukee, near the lake. The cement 
ock deposit is v^ery thick compared to most deposits of .similar rock, 
quarry face 22 feet high being worked by the Milwaukee Cement 
ompan}^. 
Analyses of natural-cement rocks, Milwaukee district, Wisconsin. 
ilica (Si0 2 ) 
luinina (A1 2 3 ) 
ron oxide (Fe 2 3 ) . . . 
hue (CaO) 
lagnesia (MgO) 
larbon dioxide (C0 2 ) 
17.00 
4.25 
1.25 
24.64 
11.90 
32.46 
17.56 
1.41. 
3.03 
25.50 
15. 45 
37.05 
:; 
17.56 
1.40 
2.24 
27.14 
13.89 
36. 45 
16. 99 
5.00 
1.79 
23.15 
16.60 
36.47 
1. Mineral Industry, vol. 6, p. 95. 
2-4. Trans. Am. Inst. Min. Eng., vol. 8, p. 507. 
The Campbell kilns in use at the plant of the Milwaukee Cement 
•ompany hold a charge equivalent to about 400 barrels (265 pounds 
ach) of cement. This is drawn at the rate of 125 to 130 barrels a day, 
11 the drawing for the day being done in ten hours. Nut and slack 
oal, mixed, are used for fuel. The fuel consumption amounts to 
bout 30 pounds per barrel of cement, equivalent to 11.3 per cent of 
le weight of the cement produced. 
Analyses of natural cements, Milwavko- district, Wisconsin. a 
lica (Si0 2 ) 23. 16 
lumina ( A1 2 3 ) 6. 33 
on oxide (Fe 2 3 ) . 1. 71 
ime (CaO) 36. 08 
[agnesia (MgO) 20. 38 
lkalies (K 2 0, Na 2 0) 5. 27 
ulphur trioxide (S0 3 ) n. d. 
arbon dioxide (C0 2 ) \ » „~ 
^ater i 
REFERENCES ON NATURAE CEMENTS. 
California. 
rimsley, G. P. The Portland cement industry in California: Eng. and Min. Jour., 
July 20, 1901. 
Connecticut. 
owrey, T. Water cement of Southington, Conn.: Am. Jour. Sci., vol. 13, 1828, 
pp. 382-383. 
Florida. 
ummings, Uriah. [Natural cement rock in Florida] : Twentieth Ann. Eept. U. S. 
Geol. Survey, pt. 6, 1899, pp. 549-550. 
Cement rock in Florida: Brick, Nov. 1, 1899. 
a Quoted by Cummings. American Cements, p. 35. 
