Word: wrench
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Dates: during 1930-1939
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...daily newspapers, more circumspect than the impetuous Lampoon, dare not antagonize a whole political machine so smoothly oiled that a monkey-wrench in the Police works hardly interrupts its powerful grinding...
...Louis Dardelet, of the French Artillery, gravely contemplated the problem of things becoming unscrewed. Neither train nor airplane wrecks motivated him, but the fact that many shells became loose in their whirling trip through the air, became duds instead of explosive missiles. No mechanic, never having touched a monkey-wrench, he set about the problem in a purely theoretical way, writing upon a piece of paper "bolt, nut, parts joined...
...bolt is greater than its friction against the face of the part that is being clamped. By mathematically designed taperings on the thread, the Dardelet nut and bolt become wedged into one mass, cannot possibly shake loose, yet are uninjured when separated. Separation is accomplished easily with a wrench...