Box FC001-S04-B19 - Album of sphygmographic tracings and tachygraphs (tachographs), 1902-1903.


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Album of sphygmographic tracings and tachygraphs (tachographs), 1902-1903.



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In 1902-1903 JE was an assistant and instructor in physiology at the Johns Hopkins Medical School (having been appointed in 1900). That year he was active in a series of experiments using what he himself described as a sphygmomanometer, an instrument to record blood pressure and arterial pulse. The data were recorded in the form of blood pressure tracings on smoked paper fixed to revolving drums, and thus termed sphygmographs in the contemporary literature. Other terms, used with greater frequency later, were kymographic tracing or kymogram, emphasizing the wave-like course of the tracings. In any case, what we have here are tracings in two formats produced between December 1902 and April 1903, one on black paper (the original smoked paper tracings) and the other on coated white paper (termed

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Item description, Reference Code, Bernard Becker Medical Library Archives, Washington University in St. Louis.

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