Studies in glazesPart IFritted glazes . to Cone 5. Glazes plotted in area IX have a heat range that aver-ages from Cone 05 to Cone 5. Glazes plotted in area X have a heat range that ex-tends onlv from 1 to 10. FRITTED GLAZES. 71 •» « . dOoa» > UJ E K \ 1111 ©1® i i ^ 1 / / ® / Z N \ ©\ ©V J ! j // > O tr0- \ \ / ® ! / / /// \ *>— * **^* . 1*^ \ g) 1 j ® .1! / 1 v •1 ^*1 ^ • \ 0* i V \ 1 / \ 0 ic . zJ M 1 © / 1 1 J j oo sis o k \ © 111 < 1 (0 2 I cr 5 i \ 8 § 1 a 6 CD 0 (ftO soixvy 72 FRITTED GLAZES. Glazes plotted in areas XI and XII have a heat rangefrom 05 to 10, those in
Studies in glazesPart IFritted glazes . to Cone 5. Glazes plotted in area IX have a heat range that aver-ages from Cone 05 to Cone 5. Glazes plotted in area X have a heat range that ex-tends onlv from 1 to 10. FRITTED GLAZES. 71 •» « . dOoa» > UJ E K \ 1111 ©1® i i ^ 1 / / ® / Z N \ ©\ ©V J ! j // > O tr0- \ \ / ® ! / / /// \ *>— * **^* . 1*^ \ g) 1 j ® .1! / 1 v •1 ^*1 ^ • \ 0* i V \ 1 / \ 0 ic . zJ M 1 © / 1 1 J j oo sis o k \ © 111 < 1 (0 2 I cr 5 i \ 8 § 1 a 6 CD 0 (ftO soixvy 72 FRITTED GLAZES. Glazes plotted in areas XI and XII have a heat rangefrom 05 to 10, those in area XI being immature and thosein area XII being fully matured at Cone 05. The glazes having the longest heat range are thoseplotted in areas V, VI, VII, VIII, IX and XII, or thosehaving an oxygen ratio of from to , inclusive, and aSi02-B2Os ratio of to Figure 7. The description of Figure 6 applies to Figure 7, ex-cept for minor details. FRITTED GLAZES. 73 cu3flwnN aiyotiO. Cpl-LVU KJ30AX0 74 FRITTED GLAZES. Figure 8. Glazes of all areas except I, VII and VIII have heatranges, the maximum points of which are Cone 5 in thecase of II and III, and Cone 10 in the case of IV, V andVI, and the minimum points of which lie in the curvebounding them on the right, except in case of III. The longest heat range shown in the case of glazeshaving Eqv. content of A1203, is found at the oxygenratios of to , inclusive, and a Si02-B203 ratio offrom to KBITTBD OLAZK8. 75 Sa39wnN dnouO
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