CUPOLA TESTS OF COKE. 49 
of the division, a series of further tests was made on some of these 
cokes. In these tests the coke bed was not kept at a constant height 
above the tuyeres, but the carbon content was calculated from the 
analysis of the particular coke and an amount taken to make up 175 
pounds of carbon regardless of the height above the tuyeres. The 
results show interesting features. Some cokes gave melting ratios 
and melting rates per hour which were better than with the ordinary 
test methods and others gave inferior results. The tests were made 
to show the advisability on the part of the manufacturer as well as 
of the foundryman of studying the conditions of cupola practice in 
order to determine those which give the best results. 
DETAILED RESULTS. 
The detailed results of the regular tests as well as of the special 175- 
pound carbon bed tests will be found in the following tables. Results 
of a typical test of Connellsville 72-hour coke are given at the head of 
the first table as a standard for comparison. All the tests here 
reported were made within the calendar year 1906 except test 190, on 
coke from Pennsylvania No. 21 coal, the date of which was February 
13, 1907. Many of the coals tested, however, were received during 
1905. 
28975— Bull. 336—08 i 
