ULL-F-092674-0000 Atomic Bomb: a drawing depicting the first controlled chain reaction in a nuclear reactor in an underground lab of the University of Chicago Credit: dpa / Ullstein Bild / Alinari Archives WARNING: Permission must be required for non editorial use. Please contact Alinari Archives Date of artwork: 02/12/1942 Period and style: International Art of 20th Century Photographer: Dpa Collection: Ullstein Bild / Alinari Archives Object type: digital image Photographic technique: P digital image Technical info Image sizes (pixel): 7015 X 3679 Image sizes (cm at 300 dpi): 59 X 31 Image sizes (MB): 5.12 Color space: RGB