Word: convexity
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...With his convex profile and his hornrimmed glasses, President Lewis J. Clark of the C.I.O. United Packinghouse Workers looks like the Caspar Milquetoast of U.S. labor. With his mere 200,000 members, many pulling at cross-purposes, he holds one of the shakiest of all union leaderships...
...scientific design could do for acoustics. He went into huddles with NBC Chief Engineer O. B. Hanson. Early in February, NBC's big studio was closed off. Workmen built a slanting roof over the stage, faced the back wall with a marcelled pattern of half columns (technical name: convex diffusers), turned the side walls into a checkerboard of curved sections-all done to encourage resonance...
...cameras. Essential part is a concave spherical mirror which gathers starlight, focuses it on a photographic plate. But mirrors hitherto could focus light from but a small section of sky on the plate without fuzzing and distortion. In the Schmidt camera, however, the light rays pass through a concave-convex lens which aims them at the mirror at such angles that they are reflected upon the plate in sharp focus (see diagram). Photographs of distant, dim nebulae formerly required exposures of 50 hours-five hours a night for ten nights. Now they can be made in a single night...
Nature's Pincers. Between the Arctic and the Black Sea lie 3,000 miles of Russian border (see map, p. 24)-as long as the U.S.-Canadian border. The long miles bulge in a great convex arc-incipient giant pincers against Russia. It was to push these pincers as far as possible from Moscow and the industrial area of European Russia that the U.S.S.R. had grabbed buffer areas every time Germany had pushed over a nation on the Soviet border...
...design eliminates the necessity for curving the photographic plate by introducing another mirror, a convex spherical mirror onto which the light is reflected immediately before going to the plate...