152 PRELIMINARY REPORT ON COAL-TESTING PLANT, [bull. iwi. 
Locomotive test of briquettes of Arkansas No. 5 coal. 
Date. 
November 28. 
November 29. 
November 30. 
Bri- 
quettes 
con- 
sumed. 
Pounds. 
9,720 
10, 049 
9,825 
Ash 
removed. 
Pounds. 
1, 250 
1,535 
1,226 
Front-end Total coal 
cinders con- 
removed, sumed. 
Pounds. 
194 
182 
228 
Pounds. 
29, 594 
Total ash 
removed. 
Pounds. 
4, 615 
Per cent 
of ash. 
L5 
Miles to 
ton. 
21.89 
Locomotive test of run-of-mine Illinois coal. 
December 1 
December 2 
December 3 
11,265 
11,050 
11, 700 
1,980 
1,558 
1,800 
130 
112 
115 
34, 015 
5, 695 
16.4 
19. 05 
A further test of Arkansas No. 5 coal was made by mixing pitches 
C and A up to one-fourth of the soft pitch C and three-fourths of the 
hard pitch A, and a briquette of good quality was obtained, but it was* 
not equal to the briquette made with 6 per cent of pitch C. Withi 
more than three-fourths of hard pitch, it was necessary to increase the 
percentage slightly, to use more steam for heating and a greater 
pressure, and the resultant briquettes were considerably inferior and 
more crumbly. 
Arkansas No. 6. — This coal was briquetted with 8 per cent of pitch 
A and made a briquette of fair quality. These briquettes were made 
in order to test the coking value of the mixture, and this work 1 
described on pages 122 and 168. 
COLORADO. 
Colorado No, 1. — The only coal that was tested from Colorado is j 
black lignite, which was first used undried with 10 per cent of pitch D'j 
As these briquettes were received from the machine, they were hard t j 
handle, especially when there was an excess of steam. The pitch di 
not seem to adhere to the grains of lignite. On cooling, however 
they became hard, black, and lustrous, but were too brittle. Th I 
adhesion of the pitch to the grains of lignite was not very great. Th j 
briquettes seemed to be too pitchy, and if the adhesion between th J 
pitch and lignite were greater 8 per cent would undoubtedly be sufl j 
cient to give the desired results. Although there was no steam te 
made with these briquettes, they were burned under one of the boile 
and proved quite satisfactory. They weighed 5.98 pounds each. Son 
of the same mixture was tested on the American machine, but tl 
eggettes were much inferior to the briquettes. 
