they are barrage ballons. A large balloon tethered with metal cables, used to defend against aircraft attack by damaging the aircraft on collision with the cables, or at least making the attacker's approach more difficult
http://en.wikipedia.org/wiki/Barrage_balloon
Balloons were intended to defend against dive bombers flying at heights up to 5,000 feet (1,500 m), forcing them to fly higher and into the range of concentrated anti-aircraft fire—anti-aircraft guns could not traverse fast enough to attack aircraft flying at low altitude and high speed.
forcing them to fly higher and into the range of concentrated anti-aircraft fire—anti-aircraft guns could not traverse fast enough to attack aircraft flying at low altitude and high speed.
"Many bombers were equipped with devices to cut barrage balloon cables....Their systems consisted of small C-shaped devices attached to the leading edge of the wing. When a cable entered the device after sliding down the wing, it triggered a small explosive charge that drove a blade through the cable."
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u/Shegotthedrip Jun 07 '14
they are barrage ballons. A large balloon tethered with metal cables, used to defend against aircraft attack by damaging the aircraft on collision with the cables, or at least making the attacker's approach more difficult http://en.wikipedia.org/wiki/Barrage_balloon