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The stethoscope which I have devised intensifies the audibility of sounds without changing their character. It consists of a set of resonators of different sizes, which are adapted to be detachably connected to a hollow, curved Y-tube that serves as a handle and also as a connection for the ear-pieces. The resonators are so constructed that they can be nested together and combined with a member which cooperates with a resonator of greater diameter to form a protecting cover for other resonators that are nested inside.
Each resonator, A, A1 and A2, is cup-shaped, with a flat top wall, and is preferably formed from metal, although some other suitable material which has a certain degree of resonance would do as well. The opening from the top wall of each resonator, 2a, communicates with opening 1a of the device B. The resonator is connected to the handle
Singer JJ. A NEW SIMPLE STETHOSCOPE. JAMA. 1914;LXIII(6):482-483. doi:10.1001/jama.1914.25710060001014