MINING CONDITIONS UNDER CITY 01' SCRANTON, PA.
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Loads and settlements of a mixture of broken sandstone and river sand confined in a cast-
iron cylinder.
Loads.	Settle- ments.	Loads.	Settle- ments.	Loads.	Settle- ments.
Pounds. 100 1,000 2,000 4.000 6.000 8,000	Inches. 0.25 .46 .66 .84 .95	Pounds. 10,000 15.000 20.000 30.000 40.000 50.000	Inches. 1.01 1.16 1.27 1.43 1.55 1.65	Pounds. 75,000 100,000 150.000 200.000 250.000 300.000	Inches. 1.83 1.95 2.12 2.25 2.34 2.42
TEST NO. 11.
This test consisted in applying a pressure to the piston of the cylinder in the same manner as in test No. 9; but cinders, formed by burning anthracite coal under boilers, were used in the cylinder instead of culm. The cylinder was filled to the top with the cinders, which had 64 per cent voids. The maximum load applied was 300,000 pounds, or 9,200 pounds per square inch, corresponding to a settlement of 5.3 inches. The loads and settlements for this test follow:
Loads and settlements for anthracite-coal cinders confined in a cast-iron cylinder.
Loads.	Settle- ments.	Loads.	Settle- ments.	Loads.	Settle- ments.
Pounds. 100 700 1.400 2.400 4.000 6.000	Inches. 0.45 .93 1.38 1.89 2.34	Pounds. 10,000 14.000 20.000 34,100 60,000	Inches. 2.85 3.23 3.55 3.99 4.41	Pounds. 100,000 150.000 200.000 250.000 300.000	Inches. 4.74 4.98 5.14 5.25 5.33
TEST NO. 14.
Pure sand was flushed into a cylinder. The sand was allowed to dry for a period of 48 hours. The top of the sand was l¿ inches below the top of the cylinder.
The following are the results of the test:
Loads and tests of Delaware River sand confined in a cylinder.
Loads.	Settle- ments.	Loads.	Settle- ments.	Loads.	Settle- ments.
Pounds. 650 2,000 5,000 10,000 20,000 30,000	Inches.	Pounds. 40.000 50.000 75.000 100,000 125,000	Inches. 0.56 .67 .90 1.00 1.25	Pounds. 160,000 175.000 200.000 250.000 300.000	Inches. 1.39 1.51 1.60 1.79 1.93
	0.05 .12 «.21 .31 .46				
a Water appeared on surface of sand.