. Transactions. 6 7 8 9 10 1,900° F. 1 2 3 4 5 6 7

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. Transactions. 6 7 8 9 10 1,900° F. 1 2 3 4 5 6 7 8 9 10 Kepeated Use at 1,750°. 1st 102d 103d 10 4th 10 COMMERCIAL CARBONIZING-MATERIALS. 409 if)a, I I I I I. 1 T Z03 :i4^ go. /Cv^\ ~^~^^ Tl ME IN HOURS

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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries