240 
[Assembly 
Isaac Hasbrouck, . . 4 kilns High-Falls of Rondout. 
Tho's D. Robinson, 2 " J mile above High-Falls. 
„ . 3 4 or 5 miles above High-Falls. 
Total number, 60 
There are 60 kilns for the manufacture of cement, each of which, on 
an average, may be estimated to yield 40 barrels per diem, when in 
operation. Most of the kilns are in operation as perpetual kilns, during 
the warmer season of the year, when the Hudson river is navigable. 
In June last, it was estimated that 600,000 barrels of cement would be 
sent to market from those kilns during the past season. It was said that 
500,000 barrels were manufactured there during the previous season. 
The Croton water works and the various government works consume 
large quantities of this cement, and its uses for various hydraulic works 
and for cisterns, wet cellars, &c. cause a continually increasing con- 
sumption. It is shipped to all our Atlantic ports and to the West In- 
dies. 
White's quarries and kilns are the most numerous, and turn oflf about 
600 barrels of cement per diem. Mr. White contracts with the quarry- 
men to quarry and burn the stone for 25 cents per barrel, while he fur- 
nishes the fuel, (dust anthracite from screened coal,) delivered at the 
kilns, removes the cement to the mills, grinds and barrels it. 
The kilns are built something in the form of a high furnace, except 
the hearth, which has a sloping sole of 40° to 45° from the back of 
the kiln to the floor of the drawing arch at the base. These kilns are 
kept in perpetual operation several months, and are charged like a high 
furnace. The dust anthracite and broken cement rock are charged, as 
usual in perpetual kilns, twice in 24 hours, each charge being introduc- 
ed in successive layers at the top of the kiln, after a quantity of cement 
has been hauled out from the sole of the kiln, into the shed next the 
drawing arch. About a ton of dust anthracite is used daily in a kiln 
that burns 40 barrels per diem. The kilns are usually built double or 
triple, that is, two or three, or even more, are built in one stack, one 
set of men being sufficient to attend several kilns. Some have roofs 
over them, others have not, but all have sheds over the drawing ar- 
ches, in consequence of the necessity of protecting the cement from 
the weather. 
