wa = 556 i CKPOOT Project 15.2 - HIGH SPEED PHOTOGRAPHY - G. L, Felt KARLY FIREBALL GROWTH The observations to be made on themes... high speed photography, were fireball growth for the first 150 microseconds. The cameras used were two Node) 100 streak cameras at 500 rps, two at 1,000 rps, two at 4,000 rpe, and two fram, ing cameras, The two fastest streak cameras and the framing camera with 16 Shakes per frome used HPS film. All other cameras were leaded with the Kastuan color film, and the calor frame camera wrote at 30 shakes per frame. The black and white framing camera had the three aided model 8 mirrer that gives 15 shakes per fram. Al) cameras had & inch lenses on thee except for the two very alow streak camsras which used 40 inch lenses, Because of the elevation of the tower, the horisontal camera slits projected on the cab to an angie abet two degrees from horisontal, BEST AVAILABLE COPY S 7 <> go Developments for the HPS fila were in the Berry developer, BD7B, for 15 minutes. The color film was developed for 5 minutes in D-76, axnept for the frem camera film which was pushed hard to get all the sensitivity possible with 2 oe minute D-76 development. oser™ - Oe as To