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[D7802ZQA], Letter from Henry May to Thomas Alva Edison, June 24th, 1878

Title: [D7802ZQA], Letter from Henry May to Thomas Alva Edison, June 24th, 1878
Editor's Notes: methods for registering heartbeats; do you use the same current on the phonograph, can it be varied?
Author: May, Henry
Recipient: Edison, Thomas Alva
Date: 1878-06-24
Type: Letter
Subject: Tasimeter; Sound and acoustics
Folder ID: D7802-F
Microfilm ID: 15:834
Document ID: D7802ZQA
URL: https://edisondigital.rutgers.edu/document/D7802ZQA
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 15