WASHING TESTS. 
By John D. Wick. 
INTRODUCTION. 
The washery plant was constructed after designs furnished by 
Roberts & Shaefer Company, of Chicago. It was under the immediate 
supervision of the writer, who was assisted by Mr. Edward Moore. 
The chemical analyses given in the report were made at the laboratory 
of the testing plant under the direction of Prof. N. W. Lord. The 
steam tests mentioned were made in the boiler room under the direc- 
tion of Prof. L. C. Breckenridge. 
Owing to the small appropriation and the great cost of all material 
and labor on the Exposition grounds, the washer}^ plant was made as 
small as possible, consisting of four 35-ton storage bins and two bins 
of half the size for holding material to be washed. On account of the 
small size of the bins holding material to be washed, it was impossible 
to wash an entire carload of coal in one operation. Washing tests, 
therefore, had to be made in lots of 10 tons or less, and for that reason 
the best results were not always obtained and not many such tests 
were made. The lack of adequate storage facilities and the constant 
demand upon the conveying apparatus for supplying fuel to the boilei 
room, the gas-producer plant, the coke ovens, and the briquettini 
machines made it frequently impossible to weigh carefully the washec 
product and the refuse material. Although complete washing tests 
were made in only a few instances, considerable coal was washed foi 
coking, but in small amounts, only sufficient for charging a single oven 
As noted in the general description of the plant (pages 10-13), th< 
washing apparatus consisted of a New Century jig and a modifie< 
Stewart jig. The former is desiged for washing very fine material 
whereas the latter will wash coal composed of pieces crushed to 
diameter of H inches. The tests made were not sufficiently complet 
to determine the efficiency of these jigs, but considerable difficulty w$ 
experienced with the New Century jig, the material being so line tha 
it packed in the bottom of the jig and thus prevented the discharge c||It 
the refuse material. The modified Stewart jig gave very good sati 
faction, and seems very well adapted to most kinds of coal. 
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