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Show Making Big Telescope Reveals New Type of Glassware for Cooking CORNING. Astronomy and cooking marched hand in hand during the three years' research which led to the development of the ultra-low expansion type of glass that was used in the great 200-inch diameter disk of glass for the new telescope of California Institute In-stitute of Technology. Astronomy obtained the disk for the telescopic mirror out of Investigations Inves-tigations In which 1,500 different kinds of glass were studied. Housewives House-wives will benefit from the same work, for one of the new glasses is now being used for a new type top-of-the-stove glass cooking utensil. uten-sil. The new style glassware has a still lower coefficient of expansion than the well-known glassware already al-ready manufactured by the glass company. The new glass, which can be placed right over a flame on the stove, is designed to supplement supple-ment rather than replace the present pres-ent oven-type glassware. What makes ordinary glass crack when heated suddenly or unevenly, Indicates Dr. J. C. Hostetter, who had charge of making the great telescope tel-escope disk, Is the large coefficient of expansion which sets up unequal stresses that finally pull the glass apart. For glassware used directly over a flame the minimum coefficient of expansion is a desirable characteristic character-istic but It must be coupled with other factors such as mechanical strength and length of useful life. |
