A 12-ft. horn-type sound detector is being tested at Ellington Field in Houston, Texas. The experimental device is used to analyze sound patterns. This photograph was received from Photographer 54316 in December 1918, and the description and details were issued with the photo under the classification CONFIDENTIAL EF 24 243.

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Size: 8425px × 5741px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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