. Transactions. 450 C ANXEAL Brin. , cZ = mm. 500° C. ANNEAL Brin. , d = mm 500° C. anneal Brin. , (i= mm. fc- mm vk^<^^ Brin. , d= mm. Fig. 8.—Etched with ammonia and hydrogen peroxide. X 75. 550 C. ANNEAL Brin. d= mm. 440 A COMPARISON OF GRAIN-SIZE MEASUREMENTS PER CENT. REDUCTION PER CENT. REDUCTION. Brin. , d= mm 450° C. ANNEAL

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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries