PROCEDURE FOR DETERMINING ROCK WEIGHTS, SIZES …

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pounds per cubic foot). Use this graph or formula unless the actual specific gravity (Gsa) is known and varies more than 5 percent (±0.13) from 2.65. To correct to the actual weight (Wa) use this formula: Wa = (W from Figure 3/2.65) x Gsa. 2. When measuring the major and minor perimeters, do not measure sharp peaks, protrusions, or valleys.

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