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[MU047], Letter from Henry Augustus Rowland, Johns Hopkins University to Thomas Alva Edison, March 9th, 1880

Title: [MU047], Letter from Henry Augustus Rowland, Johns Hopkins University to Thomas Alva Edison, March 9th, 1880
Editor's Notes: Waiting to receive your list of instruments but it hasn't come. "I will bring my own instruments as they are the only ones in the country whose constants are known in absolute measure." Three ways of experimenting: 1) your dymamometer; 2) resistance of lamp & quantity of current passing through it; 3) heat water by lamp. Last is probably most accurate for rough experiment; will need thin copper vessel & lamp with insulated wires. Should try all 3 methods. What size wire will not heat too much by current to the lamp? Also write how high your resistance boxes go, and what kind of tangent galvanometer you have.
Author: Johns Hopkins University; Rowland, Henry Augustus
Recipient: Edison, Thomas Alva
Date: 1880-03-09
Type: Letter
Subject: Research and development; Scientific and other instruments; Incandescent lamp
Folder ID: MU03-F
Microfilm ID: 95:603
Document ID: MU047
URL: https://edisondigital.rutgers.edu/document/MU047
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 95

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