The image shows the Haber synthetic ammonia catalyst testing plant at American University in Washington, It features a motor generator set and Norwalk compressor. The photograph was taken by Sgt. Hitz of the Army Signal Corps on February 4, 1920, with the symbol TAKES 1-30-20. The description of the image is the same as the caption. There is also a note with the numbers 67758, 30, 40, 10, and 1-1000.

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Size: 8457px × 5781px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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