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100 per cent American Railway Engineering bearing capacities butts computed concrete pile creosoted foundation piles creosoted piles Creosoted Timber Foundation creosoted wood piles cubic foot curve decay degree of refusal deterioration determined drop hammer economy energy delivered energy to weight examples of creosoted extraction tests fact factor final blows foot-pounds Forest Products Laboratory friction piles fungus ground surface group action hammer blow hammer energy important buildings installation lighter pile load capacity loss of creosote material pile driving pile is involved pile-driving piles for permanent practice preservative efficiency pressure creosoted railroads Railway Engineering Associa required to kill Round Tapered Piles safe load single pile submerged substratum test loadings test piles Timber Foundation Piles timber piles tion piles tons treated wood type of foundation type of pile U. S. Forest Products virtually permanent service volatility water table Weight of Pile wood foundation piles wood preservation wood treated