Cosmic ray measuring instrument readied at University of Chicago

Physicists Arthur Compton, Ernest Wollan assembling electronic apparatus with a hand inserting a vacuum tube / Drs. Wollan, Marcel Schein, William Jesse, Compton with the contraption / VS balloons rise from field of Stagg Field; men place cloth around balloon; Schein and another at left with the instrument / Jesse runs and releases the apparatus that rises in the air with portion of the stadium behind with view of numerous balloons in the air