On March 16 last, I demonstrated to the Section of General Medicine of the New York Academy, an improved stethoscope with an attachable plessimeter.1 Its daily use since then has shown me some of its imperfections and I have been working for months on the instrument with the object to improve it and above all simplify its use. I am able this evening to present to you the result of my labor, thanks to the courtesy which you extend to me as your guest, and since the instrument differs in all its details from any one thus far devised I may perhaps call it "a new binaural stethoscope."
You will see at a glance that it has neither eartips nor front springs, nor the heavy metal conducting tubes of the ordinary binaural stethoscope. Among students and in hospital services it is not infrequent that one stethoscope passes from ear to
KNOPF SA. A NEW BINAURAL STETHOSCOPE WITH ARMAMENTARIUM FOR COMPLETE PHYSICAL EXAMINATION. JAMA. 1898;XXX(1):27–28. doi:10.1001/jama.1898.72440530027002j
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