Barrage balloon winch unit with trailer, c 1939.
3 4 c m
actual image size: 32cm x 26cm

Barrage balloon winch unit with trailer, c 1939.

White, Ron

© Science Museum / Science & Society Picture Library


Model (scale 1:25). Barrage balloons were used to protect land-based targets from low-flying aircraft. This forced the enemy aircraft to fly at heights of over 5000 feet where they could be attacked by anti-aircraft guns and fighter aircraft. The balloons, approximately 20,000 feet in capacity, were divided internally into two compartments by a fabric diaphragm, the lower compartment being the air space. As they ascended, the hydrogen in the upper compartment expanded, depresing the diaphragm.



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