COKING TESTS. 45 
West Virginia No. 25. — Test 175: Light-gray color, some silvery deposit of carbon; cell 
structure a little small; breakage, long, large, fingered pieces, very brittle. 
Wyoming No. 3. — Test 52: Charge burned to ash down about 8 inches. 
Wyoming No. 5. — Test 132: No coke produced. 
CONCLUSIONS. 
It is unfortunate that the necessary routine work in order to cover 
so many coals permitted so few tests on each, and that the supply 
of coal in many cases permitted only one test to be made on that par- 
ticular coal. The data here presented show the results obtained 
under the best conditions possible to one not conversant with the 
burning of these coals, based on observations made from time to 
time as coking proceeded. These facts should be distinctly borne 
in mind when analyzing the results here presented. It is hoped 
that in future work it may be possible to vary conditions, make 
changes as they suggest themselves, and compare results on many 
different tests of the same coal and thus draw conclusions of a more 
definite nature. It is to be regretted that no comparisons can be 
made between beehive and by-product coke, but the nature of the 
work here recorded and the facilities provided confined operations 
to ovens of the beehive pattern exclusively. 
No data are given in the detailed statement for compressive strength 
or height of furnace burden supported, as the results obtained show 
conclusively the worthlessness of these determinations. This con- 
clusion was reached after careful attempts to obtain results on 1-inch 
cubes. Four cubes were selected from each coke made, care being 
taken to obtain pieces with no fracture and representing as nearly 
as possible the average of the coke. The cubes were cut by means 
of an emery wheel and guide, and although by no means perfect 
they were as nearly so as possible and always the two sides used in 
the machine were parallel. The machine used for breaking was a 
Tinius Olsen patent machine of 10,000 pounds capacity and gave 
direct readings of the ultimate strength. 
Only a few of these results, taken at random, are given, and these 
only to show their great variation and the worthlessness of this 
method of drawing conclusions. Illinois No. 16, test 10, 910 pounds, 
1,330 pounds, 2,190 pounds, and 2,270 pounds: Indiana No. 4, test 6, 
640 pounds, 790 pounds, 1,060 pounds, and 1,245 pounds; Kentucky 
No. 1, test 76, 880 pounds, 1,065 pounds, 1,920 pounds, and 2,570 
pounds; Ohio No. 9, test 94, 535 pounds, 890 pounds, 1,170 pounds, 
and 1,600 pounds; Virginia No. 1, test 68, 740 pounds, 1,120 pounds, 
1,280 pounds, and 2,060 pounds; West Virginia No. 16, test 49, 
520 pounds, 1,500 pounds, 1,780 pounds, and 2,100 pounds. 
The difficulty of obtaining a cube, or any number of cubes, to repre- 
sent anything more than the piece of coke from which it is taken is so 
apparent that results pretending to show compressive strength of any 
