COKING TESTS. 41 
Pennsylvania No. 6. — Test 41: Light-gray and silvery color; much deposited carbon; 
metallic ring; cell structure small; breakage good ; long, large pieces; very heavy; 
ash and sulphur high. 
Pennsylva7iia No. 7. — Test 30: Light-gray color; cell structure small; breakage long 
and irregular, but in large pieces; very heavy; ash and sulphur high. 
Test 33: Light-gray color; breakage, large and small lumps, very irregular; cell 
structure small; coke heavy; sulphur reduced by washing; ash not materially 
affected. 
Pennsylvania No. 8. — Test 29: Dull-gray color; breakage bad; large and small chunks; 
cell structure small; soft, dense coke. 
Pennsylvania No. 9. — Test 37: Some few pieces of coke obtained, but the amount was 
so small that it was not determined. 
Test 39: Some few pieces of coke; mostly large lumps of closely adhering ash. 
Test 42: Dull-gray color; cell structure small; poor, dense coke. 
Test 56 (with 5 per cent pitch): Dull-gray color; cell structure medium; breakage 
very irregular; large and small lumps; poor, soft coke, scarcely any better 
than coke from washed coal. 
Pennsylvania No. 10. — Test 47: Light-gray and silvery color; metallic ring; breakage 
poor, somewhat brittle; cell structure large. 
Test 53: Light-gray and silvery color; metallic ring; cell structure good; breakage 
bad; increase in yield of coke and decrease in amount of breeze probably due 
to fine grinding. 
Pennsylvania No. 11. — Test 159: Light-gray color; metallic ring; cell structure a 
little small; breakage good; long, large pieces. 
Pennsylvania No. 12. — Test 161: Light-gray and silvery color; metallic ring; cell 
structure a little small; breakage good; large pieces; good, heavy coke; sul- 
phur a little high. 
Test 162: Light-gray color; some deposit of carbon; metallic ring; cell structure 
a little small; breakage good; uniform-sized pieces; ash reduced by washing; 
good, strong coke. 
Pennsylvania No. 15. — Test 185: Dull-gray color; soft, dense coke; cell structure 
small; breakage badly cross fractured, and pieces of irregular size; sulphur 
high. 
Test 188: Light-gray color, some silvery deposit of carbon; cell structure medium ; 
breakage somewhat cross fractured, but pieces of good, uniform size; much 
improvement over coke from finely ground charge; sulphur high. 
Pennsylvania No. 17. — Test 178: Light-gray and silvery color; cell structure a little 
small; breakage good; long, large pieces; good, heavy coke. 
Test 186: Light-gray and silvery color; metallic ring; cell structure good; break- 
age good; large pieces of uniform size; good, strong, heavy coke; ash and sul 
phur reduced by washing. 
Pennsylvania No. 19. — Test 176: Light-gray color; some silvery deposit of carbon; cell 
structure small; breakage marred by cross fracture, probably due in large meas- 
ure to uncrushed slate; good, heavy coke, somewhat brittle. 
Test 177: Light-gray and silvery color; metallic ring; cell structure a little small; 
breakage good; large, uniform pieces; crushing improves physical appearances 
and increases total yield. 
Pennsylvania No. 20. — Test 179: Gray color, some silvery deposit; cell structure 
small; breakage irregular, but pieces of good size; soft, dense coke; high sulphur. 
Test 182: Gray color; soft, dense coke; no evident physical improvement oxer raw 
charge; ash and sulphur reduced by washing. 
Pennsylvania No. 21.— Test 183: Light-gray and silvery color: metallic ring; cell 
structure small but not dense; breakage somewhat marred by cross fracture, bul 
pieces of good, uniform size; good, heavy coke. 
