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[i]John Glenn called it a "dreaded" and "sadistic" part of astronaut training. Apollo 11's Michael Collins called it "diabolical." Time magazine referred to it as "a monstrous apparatus," a "gruesome merry-go-round," and, less originally, a "torture chamber." The Johnsville human centrifuge -- the machine everyone loved to hate -- was operated by the Navy at its Naval Air Development Center (later the Naval Air Warfare Center) in Warminster, Pennsylvania, just outside Philadelphia. For almost 50 years -- it ceased government operation in 1996 -- the centrifuge was the world's most powerful and versatile tool for studying the G forces that are an inescapable part of flight.[/i]
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