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With an ordinary stethoscope a doctor hears a great deal more. Body-noises closer to the instrument are heard best, and he trains his ear to concentrate on these, shifting his stethoscope from spot to spot.But the range of ordinary stethoscopes is only from sound of 200 vibrations a second to those of 1500. Probably because most heart and lung sounds are in low register, doctors have been content with this range.In the new Olson stethoscope the range is from 40 to 4000. This brings in deep basses and sopranos. The
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Texas C.
TX, USA 10 Sep 2023
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