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Indiana University Studies 



removed under water. This producer is capable of a very steady 

 and uniform flow of gas and is admirably adapted to the manu- 

 facture of lime. 



At the lime plant in New Milford, Conn., a two weeks' run showed a 

 saving over old methods of 40 per cent in fuel, and an increase of 20 per 

 cent in capacity of the kilns. The cost was lowered from 25 cents to 17.2 

 cents a barrel ot 300 pounds, and the capacity of the two kilns equipped with 

 this apparatus increased from 65 to 80 barrels to a kiln daily. 



The above is quoted from Rock Products, Vol. iv (p. 41), 

 and Vol. iii of the West Virginia Geological Survey (p. 367). 



Professor G. P. Grimsley in his comprehensive work on ''The 

 Limestone and Lime Industry of West Virginia" in Vol. iii of 

 the West Virginia Geological Survey (pp. 373-375), describes 

 five general kilns at present in use in the industry in that State 

 as follows: 



The S. W. Shoop kilns [manufacured by S. W. Shoop and Company of 

 Altoona, Pa.] . . . are known as center draught kilns and rest on a 

 foundation of common brick or stone. The stack ... is made of 

 ^-inch steel, 12 feet in diameter and 25 to 30 feet high and rests on a rock 

 foundation. The inner cylinder is made of fire brick supported by a back 

 wall of red brick. The inner diameter of the cupola is 53^ feet near the fire 

 boxes and 8 feet near the top. This leaves a space about 18 inches below, 

 between the brick cylinder and the steel cyhnder, which is filled with ashes 

 or earth packed sohd. The shape of the interior of the cupola is conical to 

 about the middle and then becomes a cylinder. The barrel below the 

 furnaces to the cooling pot is lined ^^dth fire brick so that the lime is partially 

 f'ooled before reaching the cooler pot which is made of 3^ -inch steel and about 

 4 feet long, bolted to a base 5 feet square so that it may be easily repaired. 

 The opening of this pot is closed by shears readily operated to discharge into 

 the car below. Fire brick pillars at the furnace openings into the cupola 

 prevent the lime dropping into the fire boxes and choking the draught. 



The following explanation and claims are made by the designer of tliis 

 kiln (S. W. Shoop) for the natural draught. 



'"The kiln is constructed ^^dth two chambers or ash pits to each side under 

 I he firing doors. One is located centrally underneath the other, with founda- 

 tion on the floor line connected with flumes around the cooling formation of 

 lime chamber, which gather the heat and hot air from the cooling lime and 

 distribute it underneath the grate bars. The velocity that this heat gathers 

 passing through these flumes is almost equaA to forced draught, and making 

 it the strongest natural draught kiln constructed. Not only are there ad- 

 vantages derived through draught, but a large saving in fuel is affected by 

 the utilization of this hot air. 



"Taking into consideration that it requires about 12 pounds of air (or 

 50 cubic feet) to consume 1 pound of coal, and that this air flowing under the 

 grate bars in the ordinary style of kiln at an average of 70 degrees Fahrenheit 

 has to be raised to a temperature of nearly 2,000 degrees Falu-enheit, there is 



