. Transactions. FiG. 13. Fig. 14. Fig. —Insufficiently fired English brick. cont.\ining untransformedgrains of quartz, although bordered to a depth of mm. by attack ofTHE FLXDC. Natural light; magnification. X 34. Fig. 14.—Insufficiently burned German brick, coNTAIN^NG roun-ded GRAINS OF QUARTZ, INTJICATING THE USE OF A NATURAL SAND. XaTURAL LIGHT)MAG^^FICATION, X 34. sable network, but allowing the grains of quartz to remain untrans-formed; the final heating is afterward finished in the steel process has the advantage of not introducing cristobalite into thebrick and the
. Transactions. FiG. 13. Fig. 14. Fig. —Insufficiently fired English brick. cont.\ining untransformedgrains of quartz, although bordered to a depth of mm. by attack ofTHE FLXDC. Natural light; magnification. X 34. Fig. 14.—Insufficiently burned German brick, coNTAIN^NG roun-ded GRAINS OF QUARTZ, INTJICATING THE USE OF A NATURAL SAND. XaTURAL LIGHT)MAG^^FICATION, X 34. sable network, but allowing the grains of quartz to remain untrans-formed; the final heating is afterward finished in the steel process has the advantage of not introducing cristobalite into thebrick and thereb} diminishing the danger of fracture; on the other hand,at high temperatures, brick of this character would be subject to con-siderable expansion, leading to a warping of the furnace roof. If, how-ever, the proportion of impalpable silica has been sufficient, and if thefiring has been suSicienth prolonged, the tridymite network may perhapsbe sufficiently sohd to offset the danger of expansion. We should a
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
