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Barrage balloon manufacture. Reinforcing the fins of a fish-of-the-air. These workers at the barrage balloon division, are putting double reinforcements on the right fin of a completed barrage balloon before it is deflated and sent to army training camps Every seam must be absolutely gas- and air-tight, since the tiniest pinhole would permit valuable amounts of precious helium to escape. General Tire and Rubber Company, Akron, Ohio

Barrage balloon manufacture. Reinforcing the fins of a fish-of-the-air...

Picryl description: Public domain image of an aircraft, assembly line, industrial facility, 1930s aviation, free to use, no copyright restrictions.

Barrage balloon manufacture. Spider and the flies. Putting last touches on a completed barrage balloon are these workers and their supervisor (standing). To inspect the bag for leaks, the light inside is turned off, leaving the workers in a midnight gloom. Then a co-worker on the outside takes a bright light, and works along the length of the entire balloon, back and forth, until he has covered every inch. The tiniest pinhole shines forth like a bright star in the sky, and these alert inspectors spot it and repair it. Cloth moccasins are worn inside the bag, or else stocking feet--to avoid chafing the fabric. General Tire and Rubber Company, Akron, Ohio

Barrage balloon manufacture. Spider and the flies. Putting last touche...

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.