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Summary: Shows detection of liquid blister gas after an air raid by a reconnaissance party, the discovery of the affected area, and its indication by warning signs.
Description: Squad of (ca) 6 men, plus officer, properly equipped in anti-gas rig, carrying in addition yellow cones to indicate contaminated areas, an alarm rattle and sticks on which pieces of paper coated with gas-sensitive paint are held for determining affected areas. Approach likely affected areas from windward, mark of contaminated area. 'Able Seaman Slowman' again makes mistakes.