Mar. 03, 1959 - Army Personnel Undergo ''Heat Tests'': Volunteer Army Personnel are now undergoing a series of ''Heat Tests'' at the Army Research Est. at Hampstead. The Test includes the lifting of 50 lb. ammunition boxes in rotation on and off make believe lorry tailboards in a room with humidity temp. of Dewpoint 84. This is carried out in four hour periods of 30 mins. of lifting and 30 mins. break. which includes recording periods at the end of each period four men observers examine the volunteers condition of breathing etc - Stock Image