Society of Glass Technology · [Sheffield] · leaf 181
e very near to 45° to the horizontal.The lines representing the two materials are substantially parallel,but, on comparing Fig. 5 with Fig. 4, it will be seen that the graphof the very vitreous material is almost identical with that for aChina clay having a jiorosity of 28 jier cent. On the other… … 5 10 Depth below surface [mm.)Fig. 6. actual porosity, which is only slightly higher than that of thematerial referred to in Fig. 4. Further, in comparing the twographs of Fig. 5, it must be borne in mind that although the verti-cal distance between them indicates a constant difference in…
Glass
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