Verkoeling/Cooling

August 1930: A water cart man turns the water main on a group of boys to help them cool off in a street in Westminster, London during a heatwave. (Photo by Fox Photos/Getty Images)
July 10, 1934. Three women on Blackpool promenade during a heatwave. One wears a divided skirt and the other a straight skirt, both over swimwear. The middle one has a ‘copy’ of the Letty Lynton dress made popular by Joan Crawford in the film of that name. Adapted for the mass market the triple row of frills at the hem are matched by frills at the shoulder forming cap sleeves. (Photo by E Dean/Getty Images)
August 1919: London schoolboys relax in the park during a heatwave. (Photo by Topical Press Agency/Getty Images)
9th August 1936: St John’s Ambulancemen handing out oatmeal drinks in the heat at the football match between West Ham United and Tottenham Hotspur at Upton Park. (Photo by E. Dean/Topical Press Agency/Getty Images)
27th July 1935: Pupils have a lesson in the open air in the shade of a tree at Winterbourne, Gloucestershire, during a spell of hot weather. (Photo by Fox Photos/Getty Images)

circa 1935: A policeman carrying a consignment of straw helmets at Luton Police Station. The straw version replaces the standard blue helmet in a bid to beat the hot weather. (Photo by Fox Photos/Getty Images)
1913: Nannies with their charges under a tree in Kensington Gardens, London, during a heatwave. (Photo by Topical Press Agency/Getty Images)
circa 1935: A bus driver and conductor stop for a water break during a heatwave in London. (Photo by Topical Press Agency/Getty Images)
Playing in the stream of an open hydrant, on a designated ‘play street’ in New York. Circa 1960s.