A spherical balloon is seen ready for flight at the Polo Field in Washington, This image captures the preparations for balloon operations during World War One. (Please note that the last part of the caption seems to be a mix-up of technical details and may not be relevant)

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Size: 8551px × 5778px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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