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| Results: |
productivity
The output per manshift of a colliery or metal mine. Productivity will vary with the degree of mechanization and multishift working.
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parallel firing
The firing of detonators in a round of shots by dividing the total supply current between the individual detonators.
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penetration rate
The actual rate of penetration of drilling tools.
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pentolite
A mixture of PETN and TNT used primarily for boosters and cast primers.
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percussion drill
Drill in which the drilling bit falls with force onto rock.
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PETN
pentaerythritol tetranitrate.
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Ph
The negative logarithm (base 10) of the hydrogen-ion activity. It denotes the degree of acidity of a solution. At 25 degrees C, 7 is the neutral value. Acidity increases with decreasing values below 7.
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pitmen
Workers employed in shaft sinking.
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