BRIQUETTING TESTS. 
By Joseph Hyde Pratt. 
ACKNOWLEDGMENTS. 
The writer was very ably assisted by Mr. A. A. Steel, who superin- 
tended most of the experiments made on the regular briquetting 
machines and conducted almost all of the laboratory work. Material 
assistance was also rendered by Mr. Charles H. Smith in suggesting 
ways and means and in actual experimental work about the plant. 
The success of the work is largely due to the Barrett Manufacturing 
Company, of St. Louis, and the Chatheld Manufacturing Company, oil 
Carthage, Ohio, for supplies of pitch of various grades for binder J 
to Mr. C. C. Hawkins, chemist of the Chatfield Manufacturing Com- 
pany, for suggestions and information regarding pitch, its analysis,] 
etc. ; and to Dr. Herman von Schrenk, of the Bureau of Forestiy, fo 
assistance in the rational analyses of pitch. 
BRIQUETTING PLANT. 
The briquetting plant consisted of two machines of distinctly diffeij 
ent types. One of the machines was furnished by William Johnson & 
Sons, of Leeds, England, and is designated in this report the English 
machine. This machine is one of the standard types for briquetting 
with stiff pitch, and consists of a double compression, vertical table 1 
press with closed molds and its accessories. It was operated by a 5(JJ 
horsepower inclosed motor, which was furnished by the Westinghouse ' 
Electrical Manufacturing Company, of Pittsburg, Pa. 
The second briquetting machine was furnished b}^ the National Coui-j 
pressed Fuel Company, of Chicago, 111., and consisted of a Chisholnvj 
Boyd & White press, constructed on Belgian patterns and its accessdM 
ries. This is ordinarily known as the eggette machine or press, but i* j 
designated throughout this report the American machine. It also wastfi 
operated by a 50-horsepower motor, furnished by the Westinghous* jj 
Company. 
ENGLISH MACHINE. 
In operating the English machine the coal is delivered from th< 
washer or drier by an inclined conveyor, furnished by the Robin 
Conveying Belt Company, and received upon a slightly raised plat 
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