The effect of the size of grog in fire-clay bodies. . ^9 ZQ 81 ZZ Z3 Z4- ZS 2© PERCENT POROSITY FlG. 26.—Relation between porosity and modulus of rupture at cone 12 flOOO 5000 4000 30CO 2000 1000. O 2 **• & 8 IO 12 14 16 18 SO & SURFACE FACTOR OF GfcOGFig. 27.—Relation between surf ace factor and modulus of rupture 34 Technologic Papers of the Bureau of Standards 6000 5000 &4QOO 3000 idG> H2O0Oc. a b.°10Q0 SM • 5N ,51. 50 • 5K *S^ 5J« • SS s f * •5D^ ^5B • 5A 0 2 4- 6 8 10 SURFACE FACTOR OF 12 14 16 16 20 - et Fig. 28.—Relation between surf ace factor and modulus of rupture

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