Society of Glass Technology · [Sheffield] · leaf 296
fferent forms of silica (see below) are entirely absent in the caseof alumina. Silica. A ground quartzite ganister containing 96 per cent, of SiOg wastaken for a first study of silica. It was sieved through a 25 mesh(I.M.M. Standard) sieve, mixed with 3 per cent, burned plasteradded as a slip,… … 1000° 800 600 400 200 becoming almost parallel tO the horizontal axis, and so denoting alarge and sudden expansion. This, no doubt, corresponds with theinversion of a-quartz into ^-quartz known to occur at 575°. From590° to 1000° there was no further increase in length; a very smallnegative…
Glass
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