This folder contains correspondence relating to Edison's work on a hearing aid. Following the appearance in early 1878 of articles about the phonograph, which drew attention to his own deafness, Edison began receiving inquiries about his proposed invention of a hearing aid. In 1879 many of these correspondents again wrote to Edison to inquire about the current state of the invention. There were also some original inquiries about the device.
Less than one percent of the documents have been selected. These items received significant replies or were written by individuals associated with Edison.
[D7901A], Letter from Hamilton McKown Twombly to Thomas Alva Edison, May 5th, 1879 1879-05-05
[D7901A1], Telegram from Thomas Alva Edison to Hamilton McKown Twombly, May 1879 1879-05-00
[D7901B], Letter from David S White to Thomas Alva Edison, July 2nd, 1879 1879-07-02
[D7901C], Letter from A A Ayers to Thomas Alva Edison, September 24th, 1879 1879-09-24
[D7901D], Letter from William Augustus Croffut to Thomas Alva Edison, November 5th, 1879 1879-11-05
[D7901E], Letter from Andrew S Rhoads to Thomas Alva Edison, November 7th, 1879 1879-11-07
[D7901F], Letter from Robert Desha to Thomas Alva Edison, December 12th, 1879 1879-12-12
[D7901G], Letter from Lemuel Wright Serrell to Thomas Alva Edison, December 29th, 1879 1879-12-29
[D7901H], Memorandum, Charles Batchelor, 1879 1879-00-00