American military personnel operating a dirigible balloon during World War I. In this photograph, the side propellers are turned straight down, allowing the airship to descend without loss of gas. This position is used to receive or deliver packages or messages, as well as for landing and securing the airship. The dirigible's unique ability to hold its position and save gas is a significant feat of economy.

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Size: 8421px × 5688px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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