Just in case you ever wondered what a stethoscope was for, among other things, I suspect:
"Amphoric sounds in the lungs (similar to those made by blowing across the mouth of an empty bottle), which are a sign of a tubercular cavity, were now audible to physicians, having been sufficiently amplified by a stethoscope; a lack of murmurs and a dullness when a patient’s chest area was thumped were signs of the conversion of elastic lung tissue into more fleshlike tissue; diffuse whistling sounds were a sign of irritated and partially obstructed bronchi."
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