Society of Glass Technology · [Sheffield] · leaf 78
LE THERMAL EXPANSION OF FIRECLAY, ETC. 10 Ball-clay (Fig. 3).—In the previous communication on thissubject it was shown that a sample prepared from a tough andplastic fine-grained Dorsetshire ball-clay previously burnt to cone 06showed a flattening of the curve between 500° and 600° both onheating… … the temperature-expansion graph. The effect of heating fromcone 06 to cone 0 had only changed the porosity of the test piecefrom 5-6 per cent, to 3-2 per cent., but the piece showed decidedsigns of vitrifaction and the free quartz must presumably haveundergone some change, probably from being taken…
Glass
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