[D8933AAA], Letter from Leonard and Izard, Harry Ward Leonard to Thomas Alva Edison, January 5th, 1889


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[D8933AAA], Letter from Leonard and Izard, Harry Ward Leonard to Thomas Alva Edison, January 5th, 1889

Editor's Notes

Leonard & Izard####Consulting and Contracting Electrial Eingineers####Mr. Thomas A. Edison, Dear Sir--The C.B. & Q. railroad Co. you will remember made a test upon the Edison new lamps not long since. A life test upon Edison lamps, Sawyer-Mann, United states & Perkins lamps took place a day or two since, and thinking you may be interested in the various measurements of the best lamps made by various companies today, I send you herewith data of this character. All this data applies to the condition of the lamps as they started out upon the life test. This life test will be continued until the positive position of the various lamps as regards superiority is arrived at. If there are any points in connection with the lamps of various makers which you would like to have investigated, I will take pleasure in giving such mattters attention. Each company has entered 15 or more lamps.####Yours Very truly####Leonard & Izard per H. Ward Leonard.####[enclosure: on this page is a chart entitled "Life Test by C.B. & G. Ry. Co, upon Incandescent Lamps--data regarding lamps at beginning of test--Chicago, Jan. 1st 1889.####[end. Name mentions: Leonard & Izard, Chicago Burlington & Quincy Railroad, Sawyer-Man Electric Co., Harry Ward Leonard, Thos Edison]






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Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University
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