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[D8142ZAG], Memorandum, Thomas Alva Edison, April 19th, 1881

Title: [D8142ZAG], Memorandum, Thomas Alva Edison, April 19th, 1881
Editor's Notes: TAE autograph memorandum for patent: "Draw up patent on sheets of plumbago, graphitoidal silicon, boron & Zirconium moulded by pressure preferrable in a hydraulic press.......Then placing a great number of these sheets in a closed flask and brought up to incandescenc in furnace & then the vapor of a hydrocarbon passed over the sheets so as to deposit carbon upon them. Afterwards the sheets are placed under a punch & on a die......" Can do it without depositing carbon but "I prefer to deposit because there is less breakage in punching and placing in the lamp. R increased by charcoal. Can use any kind of carbon but more difficult than graphitoidal carbon."
Author: Edison, Thomas Alva
Date: 1881-04-19
Type: Memorandum
Subject: Patent application; Incandescent lamp
Folder ID: D8142-F
Microfilm ID: 59:313
Document ID: D8142ZAG
URL: https://edisondigital.rutgers.edu/document/D8142ZAG
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 59
License: CC0 1.0 Universal

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