Word: convex
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Dates: during 1920-1929
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...Mass., was a mill-hand in a Maine lumber camp. He worked with the night shift and part of his job was to keep the boiler simmering. The boiler had a rounded clean-out door; and when John heaped up a hot fire, this door would go Crick! outward, convex like a bubble. When the fire cooled down, Crack! would go the boiler door, back inward, concave like a saucer...
Within the Spencer Thermostat, there will be a little disc of flexible metal. When an iron or percolator gets too hot, crick! will go the disc, convex like a bubble, and cut off the current. When the iron cools, crack! concave like a saucer, and the current will go on again. Two metals in the disc contract and expand with the temperature, but unequally, causing the disc to warp, crick . . . crack...
...Polygons whose Vertices lie on Convex Curves." Mr. F. H. Murray Common Room. Conant Hall...