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[N020159], Technical Note, Thomas Alva Edison, June 20th, 1879

Title: [N020159], Technical Note, Thomas Alva Edison, June 20th, 1879
Editor's Notes: Test for new lot of 100 chalks; same as earlier tests; various solutions and bases; fr. 1060 first one that is any way loud without polarizing battery; fr. 1066 "Final" chalk 2 oz caustic soda 1/4 oz 1st class
Author: Edison, Thomas Alva
Date: 1879-06-20
Type: Technical Note
Subject: Metals and minerals; Telephone
Folder ID: N020-F
Microfilm ID: 30:1046
Document ID: N020159
URL: https://edisondigital.rutgers.edu/document/N020159
Rights: Thomas Edison National Historical Park
Publisher: Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University
Has Version: Archive.org Viewer, Microfilm Series Reel 30