Haldane's oxygen apparatus for four people, London, England, 1901-1930
Haldane’s oxygen apparatus for four people allowed four patients to receive oxygen at a pre-selected concentration at any one time. British physiologist John Scott Haldane (1860-1936) was famous for bold self-experimentation. This led to important discoveries about the human body and the nature of gases. He locked himself in sealed chambers breathing lethal cocktails of gases while recording their effect on his mind and body. He visited the scenes of mining disasters and investigated their causes. The Germans first used poison gas in the First World War. Haldane went to the Front at the request of British Secretary of State Lord Kitchener. He attempted to identify the gases being used. One outcome was his invention of the gas mask. This apparatus was manufactured by George Salter and Company for hospital use.
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