An Austrian doctor, Leopold Auenbrugger, used to watch his father, a vintner, tap wine casks to discover the level of the wine inside them.
This gave Auenbrugger the idea of tapping a patient’s chest with fingers and listening to the sound produced as a guide to the internal condition of the patient. Auenbrugger published his findings in 1761, but they went unnoticed until they were translated into French in 1808.
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