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[D8104E], Letter from De Castro (D.) & Co, J B Ramirez to Thomas Alva Edison, January 5th, 1881

Title: [D8104E], Letter from De Castro (D.) & Co, J B Ramirez to Thomas Alva Edison, January 5th, 1881
Editor's Notes: Please send us all information about the megaphone. Marg: "The megaphone is a very large instrument for talking a mile away probably you refer to an instrument for the deaf. I have not had time to perfect it so as to be able to introduce it commercially."
Author: De Castro (D.) & Co; Ramirez, J B
Recipient: Edison, Thomas Alva
Date: 1881-01-05
Type: Letter
Subject: Microphone and other acoustic devices; Sound and acoustics
Folder ID: D8104-F
Microfilm ID: 57:36
Document ID: D8104E
URL: https://edisondigital.rutgers.edu/document/D8104E
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 57

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