HOW TO MAKE CONCRETE POTTERYIV. BY RALPH C. DAVISON. Fig. 15SUCCESSIVE STEPS IN MAKING THE OUTSIDE MOLD. Fig. 18TEMPLATE FOR INNER PART OF CORE. Fig. 19TEMPLATE FOR PLASTER MODEL. Fig. 21PARTS ASSEMBLED FOR CASTING PLASTER CASE. MIXTURE. Fig. 14CORRECT AND INCORRECT METHODS OF DIVIDING THE OUTSIDE MOLD. SRHYOLt ON WHICH CORE AS TURNED Fig. 16THE CORE MADE IN FOUR PIECES., scientific american, -1909-07-31


HOW TO MAKE CONCRETE POTTERYIV. BY RALPH C. DAVISON. Fig. 15SUCCESSIVE STEPS IN MAKING THE OUTSIDE MOLD. Fig. 18TEMPLATE FOR INNER PART OF CORE. Fig. 19TEMPLATE FOR PLASTER MODEL. Fig. 21PARTS ASSEMBLED FOR CASTING PLASTER CASE. MIXTURE. Fig. 14CORRECT AND INCORRECT METHODS OF DIVIDING THE OUTSIDE MOLD. SRHYOLt ON WHICH CORE AS TURNED Fig. 16THE CORE MADE IN FOUR PIECES., scientific american, -1909-07-31


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