INVASION BALLOON EXERCISES. - For story see Picture (issued 1944) shows - Long line of hydrogen cylinders being pressure tested before being moved to the quayside for inflation of balloons. Each trailer carries 30 cylinders, each cylinder holds 550 cubic feet. For the initial filling of one balloon five cylinders are used. Photographic negative , Royal Air Force

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Photo credit: © piemags/ww2archive / Alamy / Afripics
License: Licensed
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