Url https://edisondigital.rutgers.edu/document/MBN001012A Resource class dctype:Text Title [MBN001012A], Technical Note, Charles Batchelor, September 19th, 1875 Creator Batchelor, Charles Subject Microphone and other acoustic devices Publisher Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University Date 1875-09-19 Type Technical Note Identifier MBN001012A Source 90:613 Rights Thomas Edison National Historical Park Date Created 1875-09-19 Has Version https://archive.org/details/edisonmicrofilm90/page/n623/mode/1up Archive.org Viewer, Microfilm Series Reel 90 Is Part Of MBN001-F Uri https://edisondigital.rutgers.edu/document/MBN001012A https://edisondigital.rutgers.edu/document/MBN001012A --