[LB055004], Letter from Alfred Ord Tate to Munn & Co, December 31st, 1891
https://edisondigital.rutgers.edu/document/LB055004
Transcription
Dec. 31, 1891 Messrs. Munn & Co., No. 361 Broadway, New York. Dear Sirs:- With reference to the attached query, Mr. Edison says that he tested by automatic means the effect upon an incandescent lamp of throwing off and on the current fifty thousand times, and found that it made no difference in the life of the lamp. This is sent to you in compliance with the request contained in your favor of 29th instant. Yours Truly, A. O. Tate Private Secretary, M.