Word: convex
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Dates: during 1950-1959
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...massive telescopic camera specially designed for photographing meteors was shipped last week to Harvard's meteor station near Las Cruces, N.Mex. Weighing 5,000 Ibs. and mounted on an odd, horseshoe yoke, it looks like nothing else on earth. The outer lens, 18 in. in diameter, is as convex as a fishbowl. Inside are other lenses, one of them also bowl-shaped, and a 23-in. concave mirror. The film is placed between the lenses and sucked by a vacuum against the curved surface...
...lung-collapsing operation in which parts of the patient's ribs are cut out, and turned over so that they lie in a concave instead of convex position. They are sewn to the ends from which they were cut, where they cement themselves in place. Worked out by Drs. Richard H. Overholt and Leo J. Kenney of Brookline, Mass., the one-shot operation would take the place of an exhausting and expensive series now sometimes needed to collapse a tuberculous lung...