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Apparatus arrangement to determine total respiratory exchange after cessation of work in the 1911 Anglo-American Expedition to Pikes Peak

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Arrangement of apparatus for determining the total respiratory exchange at different intervals after the cessation of work at high altitude. Tubes are connected to four separate Douglas bags. (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.)