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[D7905A], Letter from P Chr Madsen to Thomas Alva Edison, February 9th, 1879

Title: [D7905A], Letter from P Chr Madsen to Thomas Alva Edison, February 9th, 1879
Editor's Notes: Copenhagen correspondent replies to TAE letter concerning current, heat & expansion of ink; maybe ink could be substituted in carbon telephone.
Author: Madsen, P Chr
Recipient: Edison, Thomas Alva
Date: 1879-02-09
Type: Letter
Subject: Telephone; Chemicals, chemical products, and chemical processes; Heat and thermodynamics
Folder ID: D7905-F
Microfilm ID: 49:602
Document ID: D7905A
URL: https://edisondigital.rutgers.edu/document/D7905A
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 49