Cosmic ray experimentation at the Franklin Institute in Swarthmore, PA

VS Mr. Alexander McKenzie and Dr. Donald Read of the Franklin Institute wear headsets and take notes as they observe a large wired electrical apparatus with a flashing light which is receiving broadcast signals from a balloon in flight; the balloon is detecting cosmic rays / another laboratory machine / Close view of an array of wires and an oscilloscope with a man's hand on panel with vacuum tubes / oscilloscope flashes readings in darkened area / hands adjust the receiving apparatus / the two scientists examine a strip of film; one of them uses a jeweler's loupe to look at an area of the film / CU pencil points to areas along strip of film / tilt-up shot telephone poles with clamps and wire rigs / Note: exact day not known