Rawin receiving antenna shown on the roof of the cosmic ray building at New York University. Working with high-altitude balloons, the rawin receiver automatically tracked the balloons as they telemetered cosmic ray neutron detection data back to the rawin set. Sky Hook balloon with cosmic ray detection equipment being launched from a US Coast Guard ship. Shown here is a cosmic ray ionization chamber for measuring variations in cosmic ray intensity. At the time this picture was taken, in September 1957, there were six such instruments operating in various parts of the world. This ionization chamber was operated at the US Coast and Geodetic Survey's Fredericksburg Magnetic Observatory.