The vapour was launched by low-velocity rocket, using a rocket-firing vehicle of the ‘Stuka Zu Fuss’ (‘Stuka on Foot’ half-track) type, which was widely available. The rockets fired canisters which were designed to release their vapour as they descended onto the target. This was extremely difficult to achieve, because of the probability of the liquid base detonating inside the canister. A vacuum system was used to prevent this. When a number of these canisters had been launched, they filled a large volume of air with their explosive gas; this volume could be up to one hundred cubic metres.
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