Url https://edisondigital.rutgers.edu/document/N315173 Resource class dctype:Text Title [N315173], Technical Note, Thomas Alva Edison, April 19th, 1886 Creator Edison, Thomas Alva Subject Telephone Heat and thermodynamics Electricity and magnetism Publisher Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University Date 1886-04-19 Type Technical Note Identifier N315173 Source 42:1033 Rights Thomas Edison National Historical Park Date Created 1886-04-19 Has Version https://archive.org/details/edisonmicrofilm42/page/n1042/mode/1up Archive.org Viewer, Microfilm Series Reel 42 Is Part Of N315-F Uri https://edisondigital.rutgers.edu/document/N315173 https://edisondigital.rutgers.edu/document/N315173 --