On this Day Factola
June 14, 1878
Speaking Phonograph Experiments
Edison and his team at Menlo Park experiment on mouthpiece of Edison's Speaking Phonograph to get the hissing consonants to reproduce better.
Experiments like this and Edison's 'Technical Notes' are part of the prismatic history of the phonograph.
Courtesy of The Papers of Thomas A. Edison, Volume 4, Edited by Paul B. Israel, Keith A. Nier, and Louis Carlat, The Johns Hopkins University Press ©1998 Rutgers, pp. 343-345