Dhows sail by an open swing bridge on the River Nile, Cairo, Egypt, c 1920s.
© National Media Museum / Science & Society Picture Library
Dhows sailing on the Nile navigate an open swing bridge, near Cairo in Egypt. Early attempts at colour photography utilized three consecutive exposures through different coloured filters, but photographers were restricted to static subjects. The introduction of the one-shot camera, which made three exposures simultaneously, extended the colour camera's repertoire to take in landscape scenes such as this Egyptian canal with Arab dhows.