The clays of Wisconsin and their uses, Issue 15

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Published by the state, 1906 - Clay - 259 pages
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Page 260 - Bulletin No. X. Economic Series No. 6. Highway Construction in Wisconsin. Ernest Robertson Buckley, Ph. D., State Geologist of Missouri, formerly Geologist, Wisconsin Geological and Natural History Survey. 1903. Pp. xvi, 339; 106 plates, including 26 maps of cities. Sent on receipt of 30 cents.
Page 11 - ... and lime (CaO), with the percentage of each given separately. The sum of these two percentages would, however, be equal to the amount of lime carbonate present. While the ultimate analysis, therefore, fails to indicate definitely what compounds are present in the clay, still there are many facts to be gained from it. The ultimate analysis of a clay might be expressed as follows : Silica...
Page 260 - D. Salisbury, AM, Professor of Geographic Geology, University of Chicago, and Wallace W. Atwood, BS, Assistant in Geology, University of Chicago. 1900. Pp. x, 151; 38 plates; 47 figures in the text.
Page 36 - ... galvanometer, has tended to restrict its use. There is no reason however why one should not be made and put on the market for a much lower price. It is not necessary that the recording instrument...
Page 261 - Survey has published three biennial reports, which relate to administrative affairs only and contain no scientific matter. First Biennial Report of the Commissioners of the Geological and Natural History Survey.
Page 260 - Washbnrn and Bayfield Counties, Wisconsin. Ulysses Sherman Grant, Ph. D., Professor of Geology, Northwestern University. 1901. Pp. vi., 83; 13 plates. Sent on receipt of lOc.
Page 35 - ... in the condition of the kiln atmosphere. As a matter of fact, however, repeated tests with a thermoelectric pyrometer demonstrate that the cones commonly fuse close to the theoretic temperatures. Manufacturers occasionally claim that the cones are unreliable and not satisfactory, forgetting that their misuse may often be the true reason for irregularities in their behavior. It is unnecessary, perhaps, to state that certain reasonable precautions should be taken in using these test pieces.
Page 259 - A Contribution to the Geology of the Pre-Cambrian Igneous Rocks of the Fox River Valley, Wisconsin. Samuel Weidman, Ph. D., Assistant Geologist Wisconsin Geological and Natural History Survey. 1898. Pp. IV., 63; 10 plates; 13 figures in the text.
Page 34 - ... but at the same time will not receive the direct touch of the flame from the fuel. It is always well to put two or more cones of different numbers in the kiln, so that warning can be had, not only of the end point of firing, but also of the rapidity with which the temperature is rising. In determining the proper cone to use in burning any kind of ware, several cones are put in the kiln, as for example, numbers .08, 1 and 5. If .08 and 1 are bent lover and 5 is not affected, the temperature of...
Page 29 - As the temperature rises the cone begins to soften, and when its fusion point is reached it begins to bend over until its tip touches the base. For practical purposes these cones are very successful, though their use has been somewhat unreasonably discouraged by some. They have been much used by foreign manufacturers of clay products, and their use in the United States is increasing.