COMPUTATION OF HEAT TREATMENTS FOR WHITEWARE BODIES *

The constant in Arrhenius’equation, when applied to the vitrification process of feldspathic whiteware bodies was calculated, using known data. Proceeding from this point, a mathematical expression for the amount of reaction taking place in a normal whiteware mixture, heated according to a given schedule, was obtained. Formulas were also derived for calculating heating schedules of various rates of temperature rise and lengths of soaking period productive of a given amount of reaction. The calculated amounts of reaction necessary to vitrify feldspathic whiteware bodies were correlated with the RO contents of the bodies. Data on the physical properties of variously heat-treated bodies are given to substantiate the validity of the formulas. A chart is given by means of which many heat-treatment problems can be solved without using the mathematical formulas.     

Changing trends in detergents

In the enormously large and varied field of cleaning agents, a review of the changing trends in the field once held chiefly by soaps. and a few chemicals, is of interest. The author has summarized the general theory and ways of preparing many of the new detergents and has indicated the direction of future research to provide many more products which will serve as agents along side of, or as substitutes for many of the old ones.     

Forstwissenschaft,Forstwirtschaft

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A. Erteilte deutsche Patente

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Zusammensetzung der Samen von Cajanus sp. und Canavalia sp., zwei brasilianischen Volksnahrungsmitteln

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