Scientific American Supplement No. 1155 from February 19, 1898. Feature on the microphonograph and its capacity to help the deaf to hear. The invention is credited to M. Dussaud alongside Dr. Jaubert and M. Berthon. The article recounts the ability of the instrument to reinforce sound, vary its intensity and be heard from a great distance.

Item number 1867
Category Newspaper
Type Science
Language English

Part of the Bill Barnes Collection