wD 2-21 of the early time spectra of a high altitude burst. 5, Make measurements of the size, persistence and spectre] irradiance of the fireball in the infra-red from a high altitude burst, 6. Study meterial ablation from specimens inside the fireball, and test the neutron vulnerability of various materials to be used in the Teak and Orange experiments. For the high altitude vent, shot Yucca, two RB=36‘s were modified to serve as instrumentation platforms. Special windows and shelves were pr> vided for the instrumentation and special wiring installed and the aircra.'t were provided with special redar equipment to track the balloon assembly and position themselves. The AOC-CIC aboard the USS CVS Boxer, which also served as the balloon launching platform, was utilized for control and as a back-up positioning system. , On shot Yucca, both the RB-36 aircraft were well positioned so thet all instruments had the burst in their fields of view. Excellent records were obtained by all projects whose instrumentetion was aboard, In addition to its particip. tion on shot Yuces, Project 8.5, making infraered measurements also perticipzted on shots Butternut and Koa as instrument checks and to obtain correlation data. The P2V also participated on events Butternut and Koa as instrumentation checks and to obtain deta for correlation of a surface detonation with the two high altitude shots Teak and Orange. On Butternut the monochrometor fail-= ed to function properly, but the meppe# functioned satisfactorily. (n Koa both instruments operated well. No data were received fram the cannister instruments on the drag line. Tentativeconelusions-which can_be made at this time are’ so CoPien tan D/D0E —_ PACE 57