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To the Editor:
—I was much interested in reading Dr. Richard Cabot's communication (The Journal, July 28). It may be of interest to know that this idea had its inception in the laboratory of physics of Purdue University. Prof. R. B. Abbott of that department had been working with the same idea in view and finally perfected the instrument, which he demonstrated first to the summer school of Purdue University in 1922. Oct. 27, 1922, he demonstrated the apparatus to the Tippecanoe County Medical Society; November 3, to the faculty of Purdue University, and November 10, to the student body of Purdue University. In each instance the large lecture room in the physics building was used. It seats 250 persons, and each was able to hear heart beats even though the auditors were in the distant corners of the room.Professor Abbott makes phonographic records with this instrument. These he
Keiper GF. "A MULTIPLE ELECTRICAL STETHOSCOPE FOR TEACHING PURPOSES". JAMA. 1923;81(8):679. doi:10.1001/jama.1923.02650080061028
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