Gelatin silver print entitled 'America's Biggest Bang', taken by an unknown photographer for Radiophoto via Associated Press, from the Daily Herald archive, 5 July 1957. 'These four pictures illustrate less than half-a-minute's growth in the huge nuclear explosion at the Atomic Proving Grounds in the Nevada Desert near Las Vegas, United States, July 5th. At top left is the fireball one tenth of a second after detonation. It forms two horns (top right) and swells into the characteristic mushroom shape (lower left). At the lower right the fireball zooms skywards with an extra rim of fire around the top, 25 seconds after detonation.'