In the early 1800s, doctors began to listen to patients' chests
to diagnose diseases of the heart and lungs. At first, the physician
put his ear to the patient's chest. One day when examining a
young lady under the watchful eye of her family, René
Laënnec was embarrassed to place his head right next to
her breast. Instead, he listened through a rolled up a piece
of paper, and found he could hear much more clearly than without
it--thus the stethoscope was invented.
Laënnec, A l'Hopital Necker, Ausculte Un Phtisique
(Laënnec, at the Hopital Necker, Examining a Consumptive
Patient by Auscultation)
Théobald Chartran (1849-1907)
Source:
http://en.wikipedia.org/wiki/Ren%C3%A9_Laennec
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