. The melting points of fire brick . 1680c 1695cFig. 4 1705c. 1570° 1580 Kanolt] Melting Points of Fire BricksTABLE I 13 Determina- Determina- tions of tions of Sample Material melting pointwithout pre- melting pointafter six vious heating hours heating deg deg 14 Fire clay f 16351 1630 1655 1655 I 1600 1635 1610 1630 27 do 16001585 1635 1640 [ 1595 ( 1710 1705 1705 1695 48 do 17051700 1705 20 J 17401 • 1745 1740 1730 f 1705 1695 41 Silica 1700| 1695 1700 1 [ 1695 a short time to near the melting point supports this No. 27 is shown in Fig. 5. After the six hours heatingthey
. The melting points of fire brick . 1680c 1695cFig. 4 1705c. 1570° 1580 Kanolt] Melting Points of Fire BricksTABLE I 13 Determina- Determina- tions of tions of Sample Material melting pointwithout pre- melting pointafter six vious heating hours heating deg deg 14 Fire clay f 16351 1630 1655 1655 I 1600 1635 1610 1630 27 do 16001585 1635 1640 [ 1595 ( 1710 1705 1705 1695 48 do 17051700 1705 20 J 17401 • 1745 1740 1730 f 1705 1695 41 Silica 1700| 1695 1700 1 [ 1695 a short time to near the melting point supports this No. 27 is shown in Fig. 5. After the six hours heatingthey appeared more uniform. Long heating in a vacuum wouldtend to vaporize the more volatile constituents of the brick, andthis might produce an appreciable increase of melting point. The most common fire brick are those made of clay, of whichthe essential ingredient is kaolin, Al203,2Si02,2H20. Shepherdand Rankin8 found that the only compound of alumina and silicathat can exist in the neighborhood of the melting points is silli-manite, Al203,Si02. It follows
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