Policeman adjusting childrens' gas masks during gas warning test at Brighton, on 17 February 1941. 'Today Brighton held a gas warning test, during which police, ARP and other workers wore their respirators. Tear gas was released in one sector of the town and several members of the public who had left their masks at home were obliged to wait outside the district until the exercise was over. The exercise lasted 30 minutes'.
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