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[D8332V], Letter from Francis Robbins Upton to Thomas Alva Edison, February 7th, 1883

Title: [D8332V], Letter from Francis Robbins Upton to Thomas Alva Edison, February 7th, 1883
Editor's Notes: Haven't yet done life test on twisted fiber lamp. Tests on Swan lamps showed that at 64 volts varied fr 55 to 95 cp. "Their economy at such candle power make it so high as to prevent their use, at such a volt." "The Swiss order makes the future look extremely rosy. 10.000 @ 50 cts = $5000 One weeks work easy."
Author: Upton, Francis Robbins
Recipient: Edison, Thomas Alva
Mentioned: Howell, John White; Swan, Joseph Wilson
Date: 1883-02-07
Type: Letter
Subject: Testing and quality control; Incandescent lamp
Folder ID: D8332-F
Microfilm ID: 67:151
Document ID: D8332V
URL: https://edisondigital.rutgers.edu/document/D8332V
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 67
License: CC0 1.0 Universal

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