 ... when this temperature has penetrated the cone. It is not advisable to use a cone a second time, in case it has not bent over in a previous burning. Such cones are apt to bend at a lower temperature. In porcelain manufacture, cones of the same composition...  Geological Survey of Michigan - Seite 24von Michigan. Geological Survey - 1900 - 67 SeitenVollansicht - Über dieses Buch
 | 1892 - 768 Seiten
...of clay products and are coming into use in the United States. Numbers .01 to 10 can be obtained for one cent each from Prof. E. Orton, Jr., Ohio State University, Columbus, Ohio. It is rather difficult to compare the thermo-electric pyrometer with Seger pyramids and say that either... | |
| |
