[LB058362], Letter from Thomas Alva Edison to James U MacKenzie, November 15th, 1893
https://edisondigital.rutgers.edu/document/LB058362
Transcription
November 15, 93. My dear Mackenzie, I understand that you are making application for the position of Superintendent of Fire Alarm System or Police Telegraph System in Brooklyn. From my knowledge of the experience which you have had in connection with Signal Telegraphy I consider you fully qualified to fill either of these positions and you have my best wishes for the success of your application. Yours very truly, Thomas A Edison J. U. Mackenzie, Esq., Brooklyn, N. Y.