Wixal - University Of The Air -- (From left to right) Professor Harlow Shapley, Director Harvard College Observatory, Dr. A.E. Kennelly, of the Electrical Engineering Department of Harvard University and co-discoverer of the Kennelly Heaviside layer which makes shortwave transmission possible; and Dr. Loring B. Andrews prominent astronomer and Chairman of Wixal programme committee. August 20, 1942. (Photo by Radio-Press- Service).