. Transactions. Fig. 30a.—Fine-grained tungsten in-got WITH FUSED CENTER. X 144. Fig. 31.—Coarse-gr.\ined tungsten in-got WITH FUSED center. X Fig. 32.—Ingot with tungsten-carbide network surrounding tung-sten GRAINS. X 950. Fig. 33.—a. Tungsten ingot con-taining BOTH THO2 AND CARBON. b. Tungsten ingot containing only ThOj. ZAY JEFFRIES 637

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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries