 | David Page - 1874 - 402 Seiten
...and occasionally the thicker beds contain a band or bands of stone. A good fire-clay should have a uniform texture, a somewhat greasy feel, and be free from any of the alkaline earths. When properly ground, pugged, and mellowed, it is fit to be worked into any form and to be baked without... | |
 | Percy Gaillemard L. Smith - 1879 - 548 Seiten
...not a very safe criterion of its qualities. The silica shown may be either soluble silica influencing the chemical constitution of the clay, or it may be...feel, and be free from any of the alkaline earths." 1 The following TABLE shows the ANALYSES of different CLAYS used for the manufacture of FIREBRICKS... | |
 | Austin Thomas Byrne - 1898 - 574 Seiten
...good fire-clay should contain from 52 'o 80 per cent of silica and 18 to 35 per cent of alumina and have an uniform texture, a somewhat greasy feel, and be free from any of the alkaline earths. Good fire brick should be uniform in size, regular in shape, homogeneous in texture and composition,... | |
 | American School (Lansing, Ill.) - 1907 - 424 Seiten
...fire-clay should contain from 52 to 80 per cent of silica and 18 to 35 per cent of alumina and have a uniform texture, a somewhat greasy feel, and be free from any of the alkaline earths. Good fire brick should be uniform in size, regular in shape, homogeneous in texture and composition,... | |
 | 1910 - 424 Seiten
...fire-clay should contain from 52 to SO per cent of silica and 18 to 35 per cent of alumina and have a uniform texture, a somewhat greasy feel, and be free from any of the alkaline earths. Good fire brick should be uniform in si/e, regular in shape, homogeneous in texture and composition,... | |
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... brick. The presence of 3 per cent of combined lime, soda, potash, and magnesia should be a cause for rejection. The sulphide of iron — pyrites — is even worse than the substances first named. A good fire-clay should contain from 52 to 80 per cent... 