856 NEW YOEK STATE MUSEUM 



In tlie first voliime of Mineral industry, Mr W. A. Smith, gives 

 the following interesting contemporary account of this kiln. 



Dnryee's revolving furnace consists of a sheet-iron cylinder, 

 Y5 feet long, inclined toward the firing end f inch to 1 foot. 

 The lower hot end is 6 feet in diameter for a length of 20 feet, 

 and is lined 9 inches thick with a mixture of ground fire brick and 

 molasses. The remainder of the cylinder, 55 feet long, has a 

 diameter of 5 feet, and is lined with 6 inch fire brick. Only the 

 lining at the hot end requires renewal, and this can be replaced 

 in 10 hours, at a cost of $25. The cylinder revolves on cast 

 iron rollers three times a minute. The power required is five 

 horse-power. 



At the lower end a small coal fire is kept up on a grate, but 

 the chief fuel is crude petroleum, introduced in a jet which, 

 meets the hot air blast. The consumption of oil is 8 gallons 

 per barrel of cement clinker produced. 15 barrels of oil are re- 

 quired to heat the furnace ready for burning cement. 



The clay and marl are mixed wet and run in as a slurry at 

 the upper end. The mixture in drying forms a sand, which, 

 moves slowly downward with the turning of the cylinder, and 

 is finally discharged at the lower end as cement clinker of the 

 size of small gravel. It takes two hours to run the particles 

 through. The operation is continuous, and the product is 250 

 barrels per day. It is claimed that all the mixture is burned to 

 Portland clinker. 



From a series of analyses and tests, for which I am indebted 



to Mr Duryee, I have selected the following: 



ANALYSES OE MATERIALS USED AK'D RESULTING PRODUCT AT 



MONTEZUMA 



MARL 1 CLAY CEMENT 



Lime... 47.68 ^ 62.22 



Silica 6.22 59.22 22.51 



Alumina 1.7 I 20 8'> i ^'^"^ 



Iron oxid ,.66 * ' "l 2.54 



Magnesia 52 3.09 1.08 



Carbonic acid .... 42.11 1.86 



1 Calculated without moisture. 



