. Transactions. •r-r ?-V-] -1-1-1-14-1-1 -ri-i t; 3 ?^ s la n sTIME IN HOURS. 3 ?^ S 6 7 S 9 TI ME IN HOURS COMMERCIAL CARBONIZING-MATERIALS. 407 Table XXllL—Material Q. 1,600° F. § (JO l-l Depth of Carbon. Over Per Cent. Cent. to Per Cent. to Per Cent. Total. 1 Grams. Per Inches. Inches. 2 3 4 5 6!

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. Transactions. •r-r ?-V-] -1-1-1-14-1-1 -ri-i t; 3 ?^ s la n sTIME IN HOURS. 3 ?^ S 6 7 S 9 TI ME IN HOURS COMMERCIAL CARBONIZING-MATERIALS. 407 Table XXllL—Material Q. 1,600° F. § (JO l-l Depth of Carbon. Over Per Cent. Cent. to Per Cent. to Per Cent. Total. 1 Grams. Per Inches. Inches. 2 3 4 5 6! 6 7 8 9 10 1,750° F. 1 2 3 4 5 6 7 8 9 10 1,900° F. 1

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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries