File:U.S. Department of Energy - Science - 278 003 006 (16493612786).jpg

INSIDE THE WORLD'S LARGEST CAMERA INSTALLED IN THE A. W. WRIGHT NUCLEAR STRUCTURE LABORATORY AT YALE UNIVERSITY.

THE OPENING BEING UNCOVERED AND THE LADDER LEADING DOWN IN TO IT PROVIDE ACCESS TO THE EXPERIMENTAL TARGETS LOCATED AT THE CENTER OF A MAGNETIC DOUGHNUT WHICH LIES BENEATH THE PLATFORM ON WHICH DR. R. L. PHILLIPS IS STANDING. CHARGED PARTICLE BEAMS FROM THE ACCELERATOR STRIKE THESE TARGETS AT VERY HIGH VELOCITIES AND THE RESULTANT FRAGMENTS PASS THROUGH 23 SLOTS AT DIFFERENT ANGLES IN THE MAGNETIC DOUGH- NUT BEFORE BEING RECORDED IN LONG PHOTOGRAPHIC PLATES HELD IN THE FOCAL SURFACE BY THE INCLINED MOUNTING UNITS TO THE RIGHT AND LEFT OF THE PHOTOGRAPH. A TOTAL OF 92 FEET OF EMULSION IS REQUIRED FOR EACH FULL EXPOSURE. THIS PHOTOGRAPH IS TAKEN THROUGH THE ENTRY HATCHWAY IN THE 18 FOOT DIAMETER SPHERE ENCLOSING THE CAMERA. AFTER THE TARGETS AND PHOTOGRAPHIC PLATES HAVE BEEN SUITABLY POSITIONED THE RESEARCHER LEAVES THE CAMERA, SEALS THE ENTRY PORT AND LARGE VACUUM PUMPS REMOVE ESSENTIALLY ALL THE ENCLOSED AIR BEFORE EACH EXPOSURE WITH THE PROJECTILE BEAM.