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Black silk material and lace acoustical fan device with metal base, 19th century.
Black silk material and lace acoustical fan device with metal base, 19th century.
Small ear trumpet, ca. 1800
Small ear trumpet, ca. 1800
Black metal conversation tube, 19th century
Black metal conversation tube, 19th century
Black metal conversation tube, ca. 1880.
Black metal conversation tube, ca. 1880.
Acoustic fan, 19th century.
Acoustic fan, 19th century.
Flower auricle or Aurolese phone, ca. 1802
Flower auricle or Aurolese phone, ca. 1802
Artificial hand or elliptical receptor, ca. 1920
Artificial hand or elliptical receptor, ca. 1920
Acousticon Model 28, No., 244/4, 1927
Acousticon Model 28, No., 244/4, 1927
Townsend trumpet, 1790 / 1801
Townsend trumpet, 1790 / 1801
Desk-top hearing instrument, circa 1875.
Desk-top hearing instrument, circa 1875.
Hal-Hen Pearl Hearing Aid Cord Necklace model, 1947.
Hal-Hen Pearl Hearing Aid Cord Necklace model, 1947.
Graph of functional gain analysis of the London Dome hearing device, circa 1984.
Graph of functional gain analysis of the London Dome hearing device, circa 1984.
Woman modeling hearing device and battery harness attached to undergarments, for Sonotone adverti...
Woman modeling hearing device and battery harness attached to undergarments, for Sonotone advertisement, circa 1950.
Young boy modeling hearing device and battery harness attached to undergarments, for Sonotone adv...
Young boy modeling hearing device and battery harness attached to undergarments, for Sonotone advertisement, circa 1950.
Rhodes Audiophone patent, circa 1879.
Rhodes Audiophone patent, circa 1879.
Western Electric 1-A Audiometer, circa 1920s.
Western Electric 1-A Audiometer, circa 1920s.
Man modeling the acoustic walking stick, circa 1920s.
Man modeling the acoustic walking stick, circa 1920s.
Western Electric 1-A Audiometer in use, circa 1920s.
Western Electric 1-A Audiometer in use, circa 1920s.
Woman demonstrating the Rhodes Audiophone while holding the Folding Dentaphone, front view, circa...
Woman demonstrating the Rhodes Audiophone while holding the Folding Dentaphone, front view, circa 1926.
Woman demonstrating the Rhodes Audiophone while holding the Folding Dentaphone, side view, circa ...
Woman demonstrating the Rhodes Audiophone while holding the Folding Dentaphone, side view, circa 1926.
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