“0410 . Thibelb ▪ .12) Fig. ISifting the mixture of alumina and oxide of chromium. Fig. SBlowpipes and oxygen cylinder in Paquier's ruby factory. Fig. 4Examining artificial rubies and mounting them on rods for cutting., scientific american, -1909-06-12

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“0410 . Thibelb ? .12) Fig. ISifting the mixture of alumina and oxide of chromium. Fig. SBlowpipes and oxygen cylinder in Paquier's ruby factory. Fig. 4Examining artificial rubies and mounting them on rods for cutting., scientific american, -1909-06-12

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