gas masks in 1930s

Men wearing gas masks exercising in a factory yard. (Photo by General Photographic Agency/Getty Images). Circa 1935

Able seamen at the Royal Navy Anti-Gas School at Tipnor, Portsmouth play ball games wearing gas masks, to accustom them to carrying out strenuous tasks in respirators. (Photo by William Vanderson/Fox Photos/Getty Images). 22nd January 1934

Nurses wearing gas masks attend to a patient, during a gas attack demonstration held at Toynbee hall, London, by the St John Ambulance Brigade. (Photo by A. Hudson/Topical Press Agency/Getty Images). 28th September 1935

Sailors fitting gas masks on to visitors at Chatham, England, where a rehearsal is being held in preparation for the opening of Navy Week. (Photo by H. Allen/Topical Press Agency/Getty Images). 1st August 1935

A soldier escorts two young visitors to the gas chambers during an open day at Kingston Barracks in Surrey. (Photo by Keystone/Getty Images). 29th June 1935

Three girls modelling various dustbowl masks to be worn in areas where the amount of dust in the air causes breathing difficulties, circa 1935. (Photo by Bert Garai/Keystone/Hulton Archive/Getty Images)