Url https://edisondigital.rutgers.edu/document/N314191 Resource class dctype:Text Title [N314191] Technical Note, March 25th, 1886 Creator Edison, Thomas Alva Subject Microphone and other acoustic devices Publisher Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University Date 1886-03-25 Type Technical Note Identifier N314191 Source 42:908 Rights Thomas Edison National Historical Park Date Created 1886-03-25 Has Version https://archive.org/details/edisonmicrofilm42/page/n917/mode/1up Archive.org Viewer, Microfilm Series Reel 42 Is Part Of N314-F Uri https://edisondigital.rutgers.edu/document/N314191 https://edisondigital.rutgers.edu/document/N314191 --