. Transactions. Fig. 24.—Tungsten ingot contain-ing PER CENT. Th02, heated 20 MIN. at 2600° C. Transverse section. X 9. Fig. 25.—Tungsten ingot contain-ing PER CENT. ThO., heated 30 2600° C. Transverse section. X 9. ZAY JEFFRIES 635. Fig. 26.—Longitudinal section at section a-a of fig. 25. X 9.

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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries