258 
CEMENT MATERIALS AND INDUSTRY. 
[bull. 24 
From a series of analyses and tests, furnished by Mr. Duryee, th 
following have been selected: 
Analyses of materials used and resulting product at Montezuma. 
Lime(CaO) 
Silica (Si0 2 ) 
Alumina (A1 2 3 ) 
Iron oxide (Fe^O s ) . . 
Magnesia ( MgO ) 
Carbon dioxide (C0 2 ~ 
Marl." 
Clay. 
47.68 
6.22 
59. 22 
1.70 
.66 
} 
20. 82 
.52 
3. 09 
42.11 
Cement. 
62. 22 
22. 51 
9.17 
2. 54 
1.08 
1.86- 
« Calculated without moisture. 
A report by Mr. W. W. Maclay, dated April 28, 1892, gives the j 
average tensile strength obtained, as follows: 
Pounds. J 
Neat, 7 days 64&I 
Mortar (1:2), 7 days 24£ 
Mortar (1:2), 28 days 41H 
The works at Montezuma were entirely destroyed by fire in June. I 
1893, and have never been rebuilt. The plant is of particular interest! 
because of the advanced technologic methods there employed. It wad 
the first American plant in which wet raw materials were fed, withouiil 
drying or briquetting, directly into rotary kilns. 
Conclusion. — The history of the above plants, which bore a certair j 
relationship to each other either in locality or management, overlaps I 
in point of date, the beginning of the present system of New Yorl i 
cement plants. The destruction by fire of the South Rondout am 1 
Montezuma plants terminated the connection of the early experi j 
menters with New York's cement industry, and the early history o j 
that industry may be said to end in 1893. As early as 1886 anothe J 
Portland plant had been erected, but this plant was managed by ail 
Englishman, and the problem was attacked in an entirely differen I 
manner. The earlier plants had been aggressively original and Ameri j 
can; the plant at Warners, with its dome kilns and wet mixing, wal 
ultra -English. Until within the last few years the typical New Yorl J 
plant has been one using marl and clay, a mixing wet, briquetting an< j 
drying, and burning in dome kilns. The Warners Portland Cemen I 
Company erected a rotary-kiln plant near Warners, Onondaga County I 
but it was in operation only a short time, and has been shut dowi .} 
since 1894. 
a There was, in fact, but one exception to this rule. The Glens Falls Portland Cement Company, t 
Glens Falls, Warren County, has operated Schofer kilns since 1894 on limestone and clay. 
