SI AND H EXPERIMENTATION 31 JULY 1951 (ROOM 20 AND 3, 6:00 TO 9:00 PM).

, To: Files Subject: SI and H Experimentation 31 July 3..951 Room s.20 and 3; 6:00.to 9:00 PM). � On Tuesday131 July. 195101111111,11111111Wfirst active participation) and the -er con uc e er en in SI H between 6:00 and 9:00 PM with s subjects and observe Prior to the first test, subjects were briefed and a discussion was held concerning previous work and some contemplated future ac- tivity...