20 WASHING, COKING, AND CUPOLA TESTS. 
panying table. Of these tests, 100 were made on raw coal, 82 on 
washed coal, 1 on raw coal with the addition of pitch, 6 on washed 
coal with the addition of pitch, 1 on washed coal with the addition of 
asphalt, and 2 on coals of widely varying composition. Of the 102 
different coals, 8, viz, Arkansas No. 9, Illinois No. 19, Indiana Nos. 3 
and 18, Ohio No. 3, Maryland No. 1, and Wyoming Nos. 3 and 5, 
produced no coke. Arkansas No. 9 and Maryland No. 1 were coked 
by the addition of pitch to washed coal. Four tests were made on 
Pennsylvania No. 9 (pp. 24, 32, 41) ; two tests with raw coal gave only a 
few pieces of coke ; a third, with washed coal, produced coke of inferior 
quality; and the fourth, with the addition of 5 per cent pitch to raw 
coal, produced coke of no better quality than that from washed coal. 
Of Indiana No. 3, Ohio No. 3, and Wyoming Nos. 3 and 5, there was 
not enough for further tests. 
TABULATION OF RESULTS. 
The results of the coking tests will be found in the detailed report 
on each sample, presented below. For convenience of comparison 
data are given as to the yield of dry coke from dry coal as well as coke 
as received from coal as charged. The analyses of both coal and coke 
as received and on dry basis are also given. No distinction is made 
between breeze and ash, as it was found impossible to separate them 
with any degree of accuracy, and both are represented in this report 
in the item "breeze." This breeze includes everything that will pass 
through a fork with tines 1 \ inches apart, after thorough shaking, and 
its percentage is much higher than that from regular operations, but 
is comparable in all tests. It was not deemed necessary or advisable 
to size the coke, 'and under this caption is included everything over 
the lj-inch tine fork. Except in a few special cases the determina- 
tion of phosphorus was not made on coke having over 2 per cent of 
sulphur, and when more than one test was made on a coal in the same 
condition this determination was also omitted. 
