Bulletin . (A) Horse-power pug mill, Boilings yard, Farmvillc. (B) Clay hank, Ivevs brickyard, Chatham Fire shrinkage Absorption Per cent Per cent .3 .3 TRIASSIC CLAYS. 23 The clay worked up with 24 per cent of water to a mass of goodplasticity, whose air shrinkage was per cent, and average tensile pounds per square inch. It was tested both by molding soft mud,and by running it through the stiff-mud machine. The soft-mud tests were as follows:Cone 010 05 03 1 These bricklets show a low fire shrinkage, and moderate were steel hard at
Bulletin . (A) Horse-power pug mill, Boilings yard, Farmvillc. (B) Clay hank, Ivevs brickyard, Chatham Fire shrinkage Absorption Per cent Per cent .3 .3 TRIASSIC CLAYS. 23 The clay worked up with 24 per cent of water to a mass of goodplasticity, whose air shrinkage was per cent, and average tensile pounds per square inch. It was tested both by molding soft mud,and by running it through the stiff-mud machine. The soft-mud tests were as follows:Cone 010 05 03 1 These bricklets show a low fire shrinkage, and moderate were steel hard at Cone 03, but had a fair ring even at Cone this cone the color was light red, but deepened at Cone 05. A sample was put through the stiff-mud machine, and flowed easilythrough the brick die without cracking. There are scattered pebbles in theclay, which would have to be eliminated by means of a rolls. The productfrom this machine gave a fair brick at Cone 010. This clay could be usedfor common brick, and might even work for hollow brick. HALIFAX COUNT
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