Word: bending
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Dates: during 1930-1939
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...South Bend...
...those that remain very likely will be in time. The difficulty of fusing quartz for so large a mirror at the great temperature required, the problem of supplying heat for such an undertaking, and the ultimate question of how to mount such a heavy thing without having it bend and distort the curvature--all these are as yet not definitely solved, but they will soon be considered...