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[D8403S], Letter from W R Edelen to Thomas Alva Edison, February 4th, 1884

Title: [D8403S], Letter from W R Edelen to Thomas Alva Edison, February 4th, 1884
Editor's Notes: [interesting TAE marg on lamp life] Has invention for producing high vac. Also wants date, hour, and place of TAE's birth. TAE marg: "We now use a pump that will reduce the pressure to 1/50 millionth of an atmosphere that costs but [7.50] made of glass. We do not find the lamps last any longer at a very high exhaustion."
Author: Edelen, W R
Recipient: Edison, Thomas Alva
Date: 1884-02-04
Type: Letter
Subject: Patent assignments, licenses, and royalties; Vacuum and glass bulb
Folder ID: D8403-F
Microfilm ID: 71:54
Document ID: D8403S
URL: https://edisondigital.rutgers.edu/document/D8403S
Rights: Thomas Edison National Historical Park
Publisher: Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University
License: CC0 1.0 Universal
Has Version: Archive.org Viewer, Microfilm Series Reel 71

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