Word: catwalks
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Dates: during 1931-1931
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...keels, for instance: instead of just one along the bottom, from nose to tail, the Akron has three-one under the top of the envelope, the two others along the sides, about a quarter of the way up from the bottom. Through each keel frame runs a triangular catwalk, the upper one giving access to the safety release valves above the helium bags. The lower ones serve as corridors to the engine rooms, airplane hangar, crew quarters, galley, messrooms; leading forward to the mooring apparatus and aft to an emergency control car inside the lower...