80 PRELIMINARY REPORT ON COAL-TESTING PLANT, [bull. 26 
The instruments and apparatus used in connection with the test 
were loaned by the manufacturers or dealers. These instrument 
are all standard, and were frequently calibrated at the Nations 
Bureau of Standards in the Electricity Building, World's Faj 
Grounds. 
During the charging of the producer the coal was carefully samplec 
the sample analyzed, and the calorific value of the coal determined i 
the chemical laboratory operated in connection with the plant. Th 
coal analyses in the appended table were supplied b} 7 Prof. N. Y\ 
Lord, in charge of the chemical laboratoiy. 
The calorimetric determinations from the gas and the gas analyse 
were made in an independent laboratory provided in the engine rooi 
near the producer plant. 
Observations and readings were taken every twenty minutes durin 
these tests, as were also the calorimetric determinations from the gai 
but in the majority of tests the gas analyses were made once ever 
two hours only. 
PERSONNEL. 
During the first few weeks the gas producer was operated under tl 
direct supervision of Mr. C. W. Lummis, a representative of R. I 
Wood & Co. Mr. Lummis was followed by Mr. C. O. Nordensoi> 
also from R. D. Wood & Co., who continued in charge of the open 
tions of the producer to the close of the season. The gas engine ha 
been run by Mr. J. G. Culbertson, a representative of the Westim 
house Machine Company. 
The observations and computations have been made by a crew I 
college men, who have been trained in various technical iustitutio 
and who have supplemented this training with practical experienc 
The men employed in these two important departments are Messii 
R. W. Cummings, H. G. Ecker, H. A. Grine, M. H. Mount, R. 
Peshak, Kurt Toensf eldt, and W. C. Weidmann. 
A double check system has been maintained throughout all comr. 
tations, thus assuring a high degree of accuracy. The operati 
supervision of the tests has been under the direct control of Cai; 
John A. Laird, a consulting engineer of St. Louis. 
METHODS OF CONDUCTING TESTS. 
The tests were begun on the basis of a total of fifty hours for es 
test. The plant was operated ten hours a day and then fires w< 
banked for the night, the records being continued the next mornii 
This permitted one test a week only. With the small crew at cc 
mand it seemed to be the best possible arrangement and was contim 
for the first two tests. It was then thought desirable to seci 
double the number of tests, and the schedule was arranged to cond 
