. Transactions. Fig. 19.—Containixg 5 per cext. 15 to 19.—Tuxgstex ingots heated 12 mix. at 3200 C. X 389. 634 METALLOGRAPHY OF TUNGSTEN. Fig. 20.—Tungsten ingot showing two large grains in position to .^sorb small grains. x 117.

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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries