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I have used a stethoscope of the Bowles diaphragm type for nearly twenty years. In this time there have been foot pieces of various shapes offered by the makers of the instrument. Most of us are familiar with the instrument, which consists essentially of a hard rubber diaphragm held in a flat metal case which serves as a tambour for the stethoscope. This tambour is connected by a single flexible rubber tube to a metal Y-shaped connecting tube from which two flexible rubber tubes form a connection with the two tubular ends of the binaural ear piece (Fig. 1). There are three types of foot pieces in common use, the large circular, the small circular and the flatiron type. The latter type has been the one that I have preferred, chiefly because of its fitting with ease into the supraclavicular spaces in the auscultation of the apexes of the lungs.
J. Birney Guthrie. MODIFICATION OF THE BOWLES STETHOSCOPE. JAMA. 1923;81(12):1013–1014. doi:10.1001/jama.1923.26510120001011