An Improved Conversation Tube to Enable Deaf Persons to Hear without Shouting

摘要

1870. Rose, E. Jan. 24. Ear appliances. -An appliance for assisting the deaf to hear consists of a mouthpiece B of the shape shown, provided at the top with a tubular metal ring a'. A flexible tube is attached to the lower end and is provided with one or more ear-pieces. The use r speaks across the mouth of the funnel.