MAREY, Etienne Jules (1830-1904), cardiologist (Marey's law) - Lot 297

Lot n° 297
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MAREY, Etienne Jules (1830-1904), cardiologist (Marey's law) - Lot 297
MAREY, Etienne Jules (1830-1904), cardiologist (Marey's law) and discoverer of chronophotography. Set of 2 documents: L.A.S. and C.V.A.S. Villa Marie, 13 December 1891 and s.l.n.d. 4 pp. in-8 and 1 p. in-16 oblong. Small split at the central fold. Interesting mail about Marey's cardiology experiments In collaboration with Chauveau, Marey discovered the cardiac variations of the excitability of the heart as well as the uniformity of the cardiac work. In this letter, he talks about his sphygmograph and his next experiment related to his discovery. It is a question of "measuring [...] the capacity of a chest and applying instruments that we have imagined", thanks to the comparison with "tracings of cardio and sphygmographs", by studying the rhythms of people doing "walking on a slope" and "walking on flat ground". He describes the course of his experiment, etc.
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