Itchin model adjustable resonator hearing device, ca. 1875
Adjustable Resonator telescopic device, black with chipped area showing gold paint. Knob on body of device allows the size of the mouthpiece opening to be controlled. The earpiece is curved and adjustable allowing it to turn in all directions and to be inserted completely inside the mouthpiece section.
15.75 in. long . (41 cm.) fully extended. 9.5" long collapsed. Receptor opening is 2" diameter
https://beckerarchives.wustl.edu/VC703-B13-i703025
VC703-B13-i703025
The collection is open and accessible for research.