. Transactions. , if of poor for almost a month at the highest temperature of the steel fur-nace is necessary to transform silica completely into tridymite. Thecrystals of tridymite thus formed by solution attach themselves to oneanother, as is always the case under similar conditions, and form the net-work above mentioned. 144 MANUFACTURE OF SILICA BRICK Quality of Brick This explanation for the superiority of siHca brick gave rise to thequestion whether variations in quahty were not exactly parallel to thecompressive strength at high temperatures. To settle this question,we req
. Transactions. , if of poor for almost a month at the highest temperature of the steel fur-nace is necessary to transform silica completely into tridymite. Thecrystals of tridymite thus formed by solution attach themselves to oneanother, as is always the case under similar conditions, and form the net-work above mentioned. 144 MANUFACTURE OF SILICA BRICK Quality of Brick This explanation for the superiority of siHca brick gave rise to thequestion whether variations in quahty were not exactly parallel to thecompressive strength at high temperatures. To settle this question,we requested, from different steel works, samples of brick which had beenused for the construction of furnaces, as to the relative quality of whichthey were able to advise us. The Ruelle and the Guerigny Works sentus well classified series of samples upon which we made tests giving theresults shown in Table 3. The tests on compressive strength at hightemperatures were made, with some samples as soon as 1600° had been. Fig. 9. Fig. 10. Fig. 9.—Tridymite crystals surrounded by a solution of magma. Brickobtained on dismantling the roof of a martin furnace. columnar crystalsand rectilinear cleavages characteristic of tridymite. natural light)magnification, x 136. Fig. 10.—Cristobalite crystals submerged in a transparent derived from relining of a Bessemer con-^erter at cleavages of cristobalite. Natural light;magnification, x 136. reached, while with other samples only after they had been maintainedat this temperature for one hour. We realized that these two methods ofproceeding might give different results in some cases. At the same time,we made determinations of a number of other physical properties, suchas absolute density, apparent density, weight of sulfate correspondingto basic oxides present, and finally compressive resistance at ordinarytemperatures. The first brick, Assailly, had remained a year in the lining of the out-let
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
