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Airframes
Benevolens Magister
There was an electrical plug socket on the top of the container, connected to the bomb release system. This activated three solenoids along the lower edge of the container, which were attached to, and activated, three simple hinged bars, which then fell open, allowing the stacks of incendiaries (in this case the hexagonal 4 pound type) to fall free.
They were normally released en masse, falling away in a huge cloud, which then broke up as the airflow affected them causing a shower over a wide area.
(There's a well-known photo of Lancaster from 100 Sqn dropping a 'cookie' and cluster of incendiaries, showing this very well.)
The empty container remained on the aircraft, to be re-filled and used again, and could hold 90 of the 4lb incendiaries which, incidentally, were composed of 'Elektron', a German developed alloy of magnesium and zinc !
They were normally released en masse, falling away in a huge cloud, which then broke up as the airflow affected them causing a shower over a wide area.
(There's a well-known photo of Lancaster from 100 Sqn dropping a 'cookie' and cluster of incendiaries, showing this very well.)
The empty container remained on the aircraft, to be re-filled and used again, and could hold 90 of the 4lb incendiaries which, incidentally, were composed of 'Elektron', a German developed alloy of magnesium and zinc !