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For many years I have tried to find some device whereby both instructor and student might hear exactly the same chest sound at the same time. I have used stethoscopes with a large bell and several pairs of ear-pieces, but with these the sounds are much weakened, and the number of students that may use them is limited to ten or less.
In 1904, I tried to design a mechanism whereby, with the aid of levers tapping on drums, and of organ bellows connected with a megaphone, the sounds of the heart and lungs might be imitated. In 1906, I demonstrated such a device at the time of the American Medical Association session in Boston.
In 1911, and in later years, reports were current that heart sounds could be passed through a telephone. I was fortunate enough to enlist the interest of an expert in telephone work, who adapted and
Cabot RC. A MULTIPLE ELECTRICAL STETHOSCOPE FOR TEACHING PURPOSES: PRELIMINARY NOTE. JAMA. 1923;81(4):298–299. doi:10.1001/jama.1923.26510040001015
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