Stethophones
Marsh's Stethoscope, or Marsh's Stethophone, is a very interesting invention. It comes with a small dial on the back which has a pointer and the letters 'L,' 'S,' and 'W' engraved on it. These stood for 'Loud,' 'Soft,' and 'Weak,' respectively. The examiner would dial in the type of sound he was listening to in order to be able to hear it better. Marsh's Stethophone, c. 1896
WINCARNIS STETHOSCOPE, c. 1890. The two small discs are interchanged and placed against the small plastic diaphragm, allowing the listener to vary the loudness and quality of the sounds conveyed. The earpieces, made of ivory, are plugged into the top of the piece in the same fashion as the Phonendoscope. The stethoscope chest piece is shown in its original case and flexible tubes with ivory earpieces and the chest piece taken apart are also displayed. Note the plastic diaphragm against which either of the two wooden disks would rest
Magniphone Stethoscope, c. 1900 was an unusual device made by The Rectophone Company, but there is no other information about this piece.