INTRODUCTION. 7 
Smoke-preventing device, automatic steam jet, by H. H. Hughes, of St. Louis. 
Thermometers and pressure gages, by the Hohmann & Maurer Manufacturing Company, 
of Rochester, N. Y. 
One Crosby recording steam gage.* 
Draft gages, by the Appliance Manufacturing Company, of Chicago. 
One Bristol recording draft gage.* 
Feed-water heater and pump, by the Stillwell-Bierce Smith-Vaile Company, of Cincinnati. 
Le Chatelier pyrometers, by Charles Engelhard, of New York. 
One Wann optical pyrometer. 
Engine indicators and attachments, by the Ashcroft Manufacturing Company, of New 
York, and the Crosby Steam Gage and Valve Company, of Chicago. 
Metallic piston packing, by the Steel Mill Packing Company, of Detroit. 
Burroughs adding machine, by the American Arithmometer Company, of St. Louis. 
Oil filter, by the Famous Filter Company, of St. Louis. 
Gas meters, by the Pittsburg Meter Company, of Pittsburg. 
Dumping car and bucket conveyors, by the Austin Manufacturing Company, of Chicago. 
Centrifugal pump, by Henion & Hubbell, of Chicago. 
Calculating machine, by the KeufTel & Esser Company, of New York. 
Power crusher and automatic sampler for preparing samples for the chemical laboratory, 
by the F. W. Braun Company, of Los Angeles, Cal. 
The plans for the buildings and their arrangement were prepared by the Roberts & 
Shaefer Company, engineers, of Chicago. 
The boiler room was thoroughly equipped with standardized apparatus for weighing 
coal and water, for determining the force of the draft, for ascertaining the temperatures 
in the different parts of the furnace, and for analyzing the flue gases. The gas producer 
and gas engines were also provided with apparatus for ascertaining temperatures, for col- 
lecting samples of the gas as produced, and for determining the horsepower developed in 
the gas engine. The electrical horsepower developed by both the steam engine and the 
gas engine was ascertained by twenty-minute readings of voltmeters and ammeters, and 
the electrical horsepower developed per pound of fuel consumed by the two different 
methods was thus accurately determined and recorded. 
The chemical laboratory was equipped with every aecessary apparatus and chemical 
material for making proximate and ultimate analyses and for determining the calorific 
value of the coal. This value was obtained by a Mahler bomb calorimeter, the observa- 
tions being made in a room especially set aside for this purpose. To this equipment was 
added during 1905 one Abbe ball mill for pulverizing; a 48-inch square steel-top table for 
quartering samples; one large drying oven for air-drying samples, and two moisture ovens 
for determining moisture at 105° C. (these ovens especially designed by Prof. N. W. Lord); 
an additional bomb and two Galaz thermometers for the Mahler bomb calorimeter equip- 
ment, and for general use in the laboratory two Troemner balances, one torsion balance, 
and a Climax gas machine (referred to above). 
The railroad companies entering St. Louis or having coal resources along their lines 
have cooperated most heartily with the officers in charge of this work. 
PERSONNEL. 
Many of the experts who were in charge of the investigations during 1904 have been 
continued in charge of the tests now being conducted. A number of additional assistants 
however, have been necessary in order that more rapid and efficient progress might be 
made with the work. In addition to the skill and services of the experts regularly em- 
ployed, the operations of the plant have been aided by the hearty cooperation and ready 
and helpful advice of leading engineers resident in many parts of the country. A general 
committee, appointed by the Director of the Geological Survey, on the investigation of coal 
and other fuels is composed of Messrs. C. W. Hayes, J. A. Holmes, E. W. Parker, and M. R. 
Campbell. 
