The Calutron Girls — this day, on 1942

The 'Calutron Girls' monitoring a mass spectrometer during the “Manhattan Project”. Gladys Owens, in the foreground, did not know what she was involved with until seeing this picture on a tour fifty years later. On this day of 1942, the 'Manhattan Project' commences, with the aim to deliver an atomic bomb Photo: Ed Westcott