thermal pulse of high-yield nuclear devices; (3) to test three types of selfrecording thermal indicators; (4) to determine, for primary data and for further laboratorystudy purposes, the effects of long-duration thermal pulse from high-yield nuclear devices on the strength of various aircraft structural . panels of the sandwich type and the temperature-time histories of these panels as a result of their exposure to such radiation; and (5) to measure the spectral distribution of thermal radiation received by an aircraft in flight for comparison with that received at corresponding ground stations. The above objectives were to be attained by (1) instrumenting stations at varying distances from GZ with calorimeters having varying fields of view and various broad-band filters, radiometers, modulated bolometers, and narrow-band recording spectrometers; (2) exposing specimens of cellulosic materials and fine natural kindling fuels; (3) comparing the data from the thermal indicators under test with that from a previously proven instrument; (4) exposing specimens of sandwich~type structural panels with various skin thicknesses‘ and types and colors of paint while recording their temperature- time histories by means of thermocouples attached to the panels; and (5) flying a narrow-band recording spectrometer in a P2V~2 aircraft operating in the vicinity of nuclear detonations. f _ In general, Program 8 stations were located adjacent to each other, wherever possible, in order to obtain a maximum amount of information with a minimum of duplication and to simplify operational planning. In addition, most of the stations were designed to be either mobile or prefabricated, re- sulting in considerable savings in both cost and field construction time. All of the projects suffered partial or total loss of data on the event of primary interest, theEE<2 to displaced air zero. ipating only on this shot, Projects partic- however, obtained at least partial data, although correction and interpretation of the data may prove to be either extremely difficult or impossible. On the reminder of the shots, good data were ob- tained by the participating projects, with the following qualifications. 1. Project 8.1 (Basic Thermal Measurements) participated in the shots of maximum from ations for An anomaly appeared in times-to-second however, good data were ob- tained from this shot as well as from It is suspected that this anomaly was due to dust obscuring the station on Runit. Analysis of pointing- camera data may provide the answer. : 2. Project 8.3 (Self-Recording Thermal Indicators) was scheduled to participate on the shot . he radex situation at the project station locations remaining from made this impossible. No other small-yield shot was suitable. 8. Project 8.5 (High Resolution Airborne Spectrometry). In addition to the objectives previously stated, this project attempted measurements of - 36 - =: 34