‘Strobotac’ stroboscope (type 631-B, serial no 2132) by General Radio Co., Cambridge, Massachusetts, 1935-1937. Used for early research on aircraft radar detection (c,1935), at the Royal Radar Establishment, Malvern and after 1946 at the Atomic Energy Research Establishment ,Harwell Strobotac by General Radio Co., Cambridge, Massach 1935
