This black metal London dome trumpet is about 26-1/2 inches long with an 8 inch uncovered sound receptor. The tube leading to the vulcanite earpiece starts in the interior of the sound receptor. There is a ring soldered to the base of the receptor, allowing the user to hook a finger through it for ease of holding. There are no markings indicating the manufacturer or date of manufacture.
Central Institute for the Deaf, 2003, (2004-020).
Hearing Aids -- 19th century; Sensory Aids
Hearing Aid, Mechanical - Trumpet
The Central Institute for the Deaf-Max A. Goldstein Historic Devices for Hearing Collection (VC703)