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2,500 PENETROMETER VALUES 4-J o cd anchorage capacity anchorage horizon anchorage material anchorage shell anchorage test methods ascending average penetrometer average penetrometer values Bail Shells bolt tensions attained borehole breakdown test data Bureau of Mines calculated cement cylinder CN CN CN CN rH rH coefficient of variation data from laboratory data from underground dial indicator Error of estimate estimate for 90-percent gage pressure H M-l g Hardness of Rockwell homogeneous materials ience of analysis indenting pin laboratory tests lb Correlation coefficient line of regression load cell maximum bolt tension Maximum Jack Load ooe'i Penetrometer and breakdown Penetrometer and pull penetrometer headpiece penetrometer readings polyethylene pounds psi FIGURE pull test data pump piston movement Regular Shells rH CN rH rH rH rH roof ROOF-BOLT ANCHORAGE screw pump Sisd statistical analysis TABLE B-l tests using bail tests using regular type of anchorage underground tests values for conven yield strength