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Recoil apparatus to measure systolic discharge of the heart from the 1911 Anglo-American Expedition to Pikes Peak

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Recoil apparatus to measure systolic discharge of the heart consists of a plank supported on rubber stoppers. The recording lever magnifies the recoil movements 60 times. (Source: Douglas CG, Haldane JS, Henderson Y, Schneider EC. Physiological observations made on Pike's Peak, Colorado, with special reference to adaptation to low barometric pressures. Philosophical Transactions of the Royal Society, Series A 1913;203:185-318.)