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Scientific American, Vol. 29, No. 26 (1873) (1873)
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usher inthe engraving. Here it in not, when pure, effervescing with acids and in being the crushed plaster is fed by a hopper, like wheat, to a burr softer. It is indeed unattacked by acids; but by the action stone mill, which reduces it to a fine powder, ready for the of water it is gradually… … The ordinary amorphous form of gypsum, or plaster stone, kettles, These, as shown in the illustration (Fig. 2), consist lime, containing, in 100 parts, 46°51 parts sulphuric acid, They are set in brick furnaces and their bot- 32°56 parts of lime, and 20°93 parts of water. © 1873 SCIENTIFIC…Internet Archive · Public domain (published before 1931). Free to use for anything.
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