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Baptismal record for John Snow, 15 March 1813; City of York.
Courtesy of the Borthwick Institute of Historical Research, University of York, via Howard Brody.Death Certificate, John Snow, 16 June 1858; London.
Courtesy of the Family Research Center, London, via Betty Vinten-Johansen.Jeffreys' Vaporizer, 1842.
Adapted from LMG 29 (1841-42): 821-22. Snow had used a vaporizer, designed by Julius Jeffreys to warm and humidify inspired air, in his clinical practice. In January 1847 Snow designed an inhaler in which the volute and ether chamber were modeled on Jeffreys' construction.
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