Bulletin . f80% Crawfordsville shale and 207^^ ferric oxide and flint,we observe at once that the reactions appear complex, andby no means continuous. In the Cone 2 curve we havethree distinct minimum points. We also observe that thereactions, whatever they may be, begin at a low tempera-ture, since the curves lie very close together. With 6%FCgOg even the Cone 01 curve has come considerably belowthe porosity shown in the normal shale at Cone 2. Weobserve in this connection the fact that at Cone 01 theshale shows a lower porosity than at Cone 2, This increasein porosity at the higher temperatu
Bulletin . f80% Crawfordsville shale and 207^^ ferric oxide and flint,we observe at once that the reactions appear complex, andby no means continuous. In the Cone 2 curve we havethree distinct minimum points. We also observe that thereactions, whatever they may be, begin at a low tempera-ture, since the curves lie very close together. With 6%FCgOg even the Cone 01 curve has come considerably belowthe porosity shown in the normal shale at Cone 2. Weobserve in this connection the fact that at Cone 01 theshale shows a lower porosity than at Cone 2, This increasein porosity at the higher temperature appears to be due tovesicular structure, which is observed even before vitrifica-tion is reached at any point. With 16% FesOg the shalemixture reaches complete vitrification at Cone 2, at whichtemperature the normal shale has a porosity of 11%. In a mixture of 75% Canton shale and 25% ferric TRANS AM CER 50C VOLX. BLEININGER AND MOORE 4-0 30 m20 FIG SHALE-807oFLINT+Fe203--20% . FtetOj Z + 6 8 10 12 14 16 18 20 FLINT 19 16 1+ 12 10°/o COMPOSITION 8 6 4 2 0 62 THE INFLUENCE OF FLUXES AND NON-FLUXES UPON THE CHANGES oxide and flint, Fig-. 52, we observe somewhat similar con-ditions. Complete vitrification is reached here as low asCone 01, at which temperature the normal shale has aporositv of 12%. This point occurs with a mixture of 10%FCoOg, 15% flint, that is, with a ratio of 2:3. The Galesburg- shale seems to behave more regularlythan the preceding- clays, and does not appear to producethe vesicular structure observed in the former. No decided(hange seems to take place at Cone 2 for the changes in theiron-flint ratio, Fig. 53. The individual vitrification curves of these shales-irou-flint combinations are illustrated in Figs. 54, 55, 5fi. Similar results have been obtained by A\orcester inexperiments involving the production of mixtures of redBedford shale and ground Berea grit. ADDITION OF FERRIC OXIDE-LIME. iSf/iff/e*. Here we observe that in a
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