■KEL.1 
INDIANA AND KENTUCKY. 
341 
NATUEAL-CEMENT RESOURCES OF INDIANA AND 
k i :ntitcky. 
The plants of the " Louisville district " are mostly located in Indi- 
ina, though one or two mills are in operation on the Kentucky side of 
he Ohio River. The rock is a fine-grained, cla3 7 ey limestone of the 
)evonian age. In color it varies from light drab to dark or bluish 
Irab, when fresh, weathering to a dull buff on long exposure. The 
sement bed varies from 10 to 16 feet in thickness in the different 
marries. 
Analyses of natural-cement rock, Louisville district, Indiana- Kentucky. 
>ilica (SiO a ) 
Uuniina ( A1 2 3 ) 
ron oxide ( Fe 2 3 ) 
.ime (CaO) 
Magnesia ( MgO ) 
S&rbon dioxide (C0 2 ) 
1 
2 
:} 
4 
5 
9.69 
9.80 
13. 65 
15. 21 
18.33 
2.77 
2.03 
3.46 
4.07 
4.98 
1.95 
1.40 
1.45 
1.44 
1.67 
29.09 
29.40 
34. 55 
33.99 
30.41 
15. 69 
16.70 
7.97 
7.57 
8.04 
40. 14 
41.49 
35. 92 
35.03 
32. 76 
13.36 
3.46 
1.58 
31.49 
11.19 
37. 07 
Analyses 1 to 5, inclusive, are by W. A. Noyes. Quoted by Siebenthal, Twenty-fifth Ann. Rept. 
ndiana Dept. Geol. Nat. Res., pp. 380-380. 
1. Hausdale mill, New Albany Cement Company; used for "Crown" brand. 
2. Ohio Valley mill, Ohio Valley Cement Company; used for "Fern Leaf" brand. 
3. Falls City mill, Union Cement and Lime Company; used for "Diamond" brand. 
4. Speed mill, Louisville Cement Company; used for " Star" brand. 
5. Black Diamond mill, Union Cement and Lime Company; used for " Black Diamond " brand. 
6. Average of the preceding five analyses. 
Two styles of kiln are in use in the Louisville district. The older 
ind smaller kilns are 36 feet in height, 8 feet in diameter at the top, 
3nlarging to 12 feet at a point 21 feet above the base, and again con- 
tracting to 4 feet at the base. These are drawn from a chute by use 
:>f a swinging gate or apron. Coal and rock are charged in alternate 
layers. About a week suffices for the passage through the kiln of any 
particular mass of material. These small kilns produce about 100 to 
J 25 barrels (265 pounds each) of cement a day. 
The larger kilns are 51 feet from extreme base to top. Viewed from 
the outside they appear to be cylinders 54 feet high and 16 feet in 
diameter. Their interior space, however, is 10 feet in diameter at the 
top, enlarging to 12 feet at a point 18 feet above the base. Below this 
level, though the interior walls still slope outward, the space is really 
contracted by the occurrence of a conical mass of brickwork in the 
center of the kiln. This cone throws the downcoming clinker toward 
the draw gates at the sides. A 9-inch lining of fire brick is set around 
the kiln space proper. This is followed by 9 inches of common brick, 
and the space between the common brick lining and the exterior kiln 
