'Mixed Humanity', early 20th century.
© NMeM / Royal Photographic Society / Science & Society Picture Library
Gelatin silver print. Photograph by Horace W Nicholls of a religious meeting at the Derby horse-racing course in Epsom, Surrey. Banners in the foreground read: 'Behold the Lamb of God' and 'Open-Air Mission'. Henry Bradberry is one of numerous 'tick-tack' men, racecourse bookmakers who used manual semaphore to communicate the odds on horses.