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Blacks formula

a translation of pignets formula into British measurements: f = (W _ c) -H; f is the empirical factor, W is the weight in pounds, c the chest girth in inches at full inspiration, and H the height in inches; a man is classed as very strong when f is over 120, strong between 110 and 120, good 100 to 110, fair 90 to 100, weak 80 to 90, very weak under 80.