. Journal. in order to reduce the cold glass at thesurface of the mass.—\V. C. H. French Patents. Quartz-Glass ; Method for the Manufacure. at a Rela-tively Low Temperature of a Composition of Free from Air-bubbles. J. Bredel. Fr. Pat. 355,791, July1. quartz or other material to be fused is first heatedin a current of hydrogen at a temperature of about1200° C, at which it is permeable by hydrogen. Thelatter combines with the oxygen of the air in the inter-stices of the material, the resulting steam largely expellingthe residual nitrogen. The current of hydrogen is thenstopped, and the
. Journal. in order to reduce the cold glass at thesurface of the mass.—\V. C. H. French Patents. Quartz-Glass ; Method for the Manufacure. at a Rela-tively Low Temperature of a Composition of Free from Air-bubbles. J. Bredel. Fr. Pat. 355,791, July1. quartz or other material to be fused is first heatedin a current of hydrogen at a temperature of about1200° C, at which it is permeable by hydrogen. Thelatter combines with the oxygen of the air in the inter-stices of the material, the resulting steam largely expellingthe residual nitrogen. The current of hydrogen is thenstopped, and the material immediately exposed to theaction of an oxyhydroeen blow-pipe flame rich in oxygen,whereby the combustion of the hydrogen in the interiorof the material is continued, and a liquid mass free fromair-bubbles obtained at the relatively low temperature of1950—2000- C—A. G. L. Glass ; Continuous Electric Furnace for Production of and Other Products. V. M. Sauvageon. Fr. ,824. July 3. V/////////////^//////^///jl///////. F.^2 JXJX. IX
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectchemist, bookyear1882
