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Edison and a searchlight, 1915This searchlight used a new gas-filled, tungsten-filament lamp -- an improvement (developed in 1913 by GE's Irving Langmuir) which was rapidly replacing the vacuum, carbon-filament lamp pioneered by Edison. The cart in the photo is labeled "Edison Storage Battery Co.," an indication of the direction in which the inventor's interests had turned.
SI negative #87-1654
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