. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. :S86 GLASS-MAKING. sidiary furnaces to a 1. A reverberatory furnace or calcar, for calcining orfritting the materials; 2. a blow-ing furnace, for blowing the pear-shaped balls, made at the pot-holes, into large globes; 3. aflashing furnace, and bottominghole for communicating a soften-ing heat, in expanding the globeinto a circular plate; 4. theannealing arch for the finishedtables; 5. the reverberatory ovenfor annealing the pots prior totheir being set upon the foundi
. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. :S86 GLASS-MAKING. sidiary furnaces to a 1. A reverberatory furnace or calcar, for calcining orfritting the materials; 2. a blow-ing furnace, for blowing the pear-shaped balls, made at the pot-holes, into large globes; 3. aflashing furnace, and bottominghole for communicating a soften-ing heat, in expanding the globeinto a circular plate; 4. theannealing arch for the finishedtables; 5. the reverberatory ovenfor annealing the pots prior totheir being set upon the foundingsiege. The materials of crown glassused to be, fine sand, by measure5 parts, or by weight 10; groundkelp by measure 11 parts, or byweight Itjj; but instead of kelp,soda ash is now generally 6 to 8 cwts. of sand, lime,and sodaash, mixed together inwooden boxes with a shovel, are thrown on the sole of a large reverberatory, such as isrepresented in the article Copper. Here the mixture is well worked together, with ironpaddles, flat shovels, and rakes with long handles; the area of this furnace being about6 feet square, and the height 2 feet. The h
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Keywords: ., bookcentury1800, bookdecade1840, booksubje, booksubjecttechnology
