A practical treatise on the manufacture of colors for painting : comprising the origin, definition, and classification of colors; the treatment of the raw materials .. etc. . molten metal, and to maintain a constant flow of pipe m connects the pump d with a gasholder, when gas, instead of atmospheric air, isemployed. In the case of air, the pipe m is dis-connected at n. The piston of the pump d is set inmotion by the side rod o, attached to the crank pwhich is fixed on the same axis as the pulley q. Fig. 5 shows the disposition which prevents theadmixture of the metal with the oxid
A practical treatise on the manufacture of colors for painting : comprising the origin, definition, and classification of colors; the treatment of the raw materials .. etc. . molten metal, and to maintain a constant flow of pipe m connects the pump d with a gasholder, when gas, instead of atmospheric air, isemployed. In the case of air, the pipe m is dis-connected at n. The piston of the pump d is set inmotion by the side rod o, attached to the crank pwhich is fixed on the same axis as the pulley q. Fig. 5 shows the disposition which prevents theadmixture of the metal with the oxide. The inclinedmetallic plate a, of iron or other metal, is attached tothe pipe b, a little above the perforated ball c. Thecurrent of air is conducted by a up to the edge F ofthe kettle, and there is no agitation on the surface ofthe bath, where the oxidation takes place. 108 MANUFACTURE OF COLORS. Fig. 6 explains another mode of oxidizing oxide of manganese is put into the iron pot A, Fig. 5. Fig. having holes at b and D, and a handle s. When thispot is immersed in the bath, the metal penetratesthrough B, and heats the manganese, which disen-gages oxygen and rapidly oxidizes the metal. If the metal employed be lead holding silver, thelatter, not being oxidized, goes down to the bottom ofthe kettle, from which it is removed through the plugN (Fig. 7), of the pipe mo, which is kept hot by afire at R. Fig. 7.
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Keywords: ., bookcentury1800, bookdecade1870, bookpublisherphila, bookyear1874
