lord.] WORK OF CHEMICAL LABORATORY. 31 
moisture, each sample of coal, after a rapid preliminary crushing to 
about one-fourth inch size and reduction in bulk by quartering where 
desirable, was weighed and then exposed to the air for about twenty- 
four hours, or until the loss of weight on further exposure became 
slight. 
The loss of weight thus determined constitutes the ''loss on air dry- 
ing." The coal in this air-dried condition was then pulverized for the 
final sample to be used in the various operations of the laboratory. 
The reduction of the actual results obtained upon the air-dried sam- 
ple to the equivalent results on the original sample before air drying 
was accomplished as follows: Each of the results upon the air-dried 
sample was multiplied by the fraction the air-dried coal formed of the 
original coal and then (in the proximate analyses) the percentage loss 
on air drying was added to the figure for moisture so obtained. 
In the case of an ultimate analysis the figures so obtained for the 
oxygen and the Irydrogen were each increased by amounts equivalent 
to the oxygen and Irydrogen represented by the loss on air drying 
when considered as water. 
METHODS OF ANALYSIS. 
The methods of analysis were essentially those recommended by the 
committee of the American Chemical Society. The moisture was 
determined b} T drying the weighed sample for one hour in an air 
bath at 105° C. The calorific value was determined in the Mahler 
bomb calorimeter. The actual value of the result in the calorimeter 
was corrected for the sulphuric acid formed in the bomb. 
In calculating the calorific value from the ultimate analysis the 
calorific values of hydrogen, carbon, and sulphur were taken as, 
respectively, 34,^00, 8,080, and 2,250 calories. 
PERSONNEL. 
Mr. E. E. Somermeier, of the department of metallurgy of the Ohio 
State University, was chief chemist and had immediate charge of the 
laboratory ati the testing plant. The assistant chemists employed in 
the laboratory were Mr. F. M. Stanton, Mr. John II. Crawford, jr., 
and Mr. G. A. Burrell. Mr. F. A. Bryan was employed in collecting 
the car samples and washery samples at the plant. 
ANALYSES OF MINE AND LABORATORY CAR SAMPLES. 
The following table gives in a condensed form the analyses of 
mine" and "laboratory car" samples arranged according to States: 
