'Esna Barrage acros the Nile', Egypt, c 1920.
© Science Museum / Science & Society Picture Library
'View from the West Bank, showing the roadway with rail track, and the crab winch track on the upstream parapet. Note the method of securing the sluice gate chains'. The Esna Barrage is south of Luxor in Egypt along the River Nile. It was built in 1906-1908 to control the waters of the annual Nile floods with the aim of improving irrigation and increasing the area of cultivable land.