CUPOLA TESTS OF COKE. 
By Richard Moldenke. 
EQUIPMENT. 
Owing to the removal of one of the cupolas which served for the 
foundry tests during the Louisiana Purchase Exposition all the tests 
made since then have been conducted in the 36-inch foundry cupola 
loaned by the Whiting Foundry Equipment Company, of Chicago. 
The remaining apparatus was rearranged and the 36-inch shell of the 
cupola was relined to 26 inches internal diameter. There were four 
horizontal tuyeres measuring 4 by 6 inches on the outside and 3 by 13 
inches on the inside of the cupola which were situated 1 1 inches above 
the sand bottom. The total tuyere area was 96 square inches, giving 
a ratio of 1 to 5.96 with the cupola area. A No. 6 Sturtevant fan run 
at 2,514 revolutions per minute furnished the blast, which was kept 
at about 7 ounces. 
By proper training, the crew was- able to run off two heats a day 
without interruption. The melted iron was poured into molds for 
sash weights, thus reducing to a minimum the amount of scrap made. 
PERSONNEL. 
The cupola tests were conducted by W. G. Ireland, under the 
direction of A. W. Belden, coke expert of the Geological Survey, and 
by the advice of Richard Moldenke, foundry expert in charge of the 
cupola tests of the fuel-testing plant. 
METHOD OF TESTING. 
The method of testing has been fully described in the report of the 
fuel-testing plant for 1904. ° Toward the^nd of the tests it was some- 
times necessary to vary the proportion of scrap to pig iron according 
to the supply, but the total amounts were kept correct as planned for 
the general series of tests. 
After completing the tests on the available cokes in the regular 
way, so that the results might be comparable with the previous work 
oProf. Paper U. S. Geol. Survey No. 48. part 3, 1906, pp. 1367-1370. 
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