Indianapolis Times, Indianapolis, Marion County, 27 May 1948 — Page 20

: By DAVID DIETZ

ptory of the priceless 200-inch mirror. When Rockefeller funds were made available back in 1928, : : he paramount question was: Can a 200-inch mirror: be fashfoned? The trials and tribulations that went into finding the answer constitute one of the great sagas of scientific tri-

umph, The largest mirror which had been cast, ground and polished to astronomical accuracy up to that time was the mirror in} the 100-inch telescope on Mt. Wilson.

Mr. Diets

Stronger Glass Needed While the 00-inch mirror worked admirably, it was ap-| parent that something better than plate glass was required for a mirror twice the diameter or four times the area. It will be recalled that the Rockefeller Foundation gave the funds for the 200-inch telescope to the California Institute of Technology. The institute created an observatory council to consider this and other problems. Its chairman was Dr. George Ellery Hale, then director of the Mt. Wil-

council. One was the use of fused quartz, the second was Pyrex glass—Ilike the pie plates in your kitchen—the third was stainless steel, and the fourth was a thin coating of glass fused to a special metallic alloy. After considerable discussion, the Observatory Council decided to try fused quartz. Chemically, quartz is silicon dioxide or silica. You are most familiar with it in the form of white sand on a bathing beach. -

To make a mirror from it, a

and then cast In the desired mold. The resulting disc is full of bubbles but this is not important because a top layer of perfectly pure quartz, free from bubbles is

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RESEARCH shown in one-¢ number of lette soup. Ummm-—

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