Foster's formula

Foster's formula

[′fȯs·tərz ′fȯr·myə·lə]
(mining engineering)
The empirical formula R = 3√(DT) for determining the radius R of a shaft pillar, where D = depth in feet and T = thickness of lode in feet.
References in periodicals archive ?
Ruthie Foster's formula for success is prayer, praise and exercise.
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