om, Project 1.1- Basic BlastMeasurements - J. J. Meszaros OBJECTIVES The primary objective of Project 1.1 was to measure and record the blast pressure at various distances from a high yleld air burst in the megaton range. Secondary objectives were the measuring of dynamic pressure vs time at the same ground distances with the exception of the station located at the intended GZ point. Also Project 1.1 was requested to make measurements of the diffraction of the shock wave over the man-made islands and around the Project 3,1 structures. INSTRUMENTATION t The Ballistics Research Laboratories (BRL) self-recording pressure gages were the basic instrumentation used for measuring air blast pressures. the detonation. The gage is activated from the flash of A back-up method for triggering the gage is a thermal link that disengages when heat is applied. The gage used to measure dynamic pressure is also a self recording gage designed at BRL and referred to as a "q" gage, A total of 11 contractor installed stations were instrumented with one 3 foot "q" gage and three pressure-time gages. The project installed sixteen stations which included 14 pressure-time gages and three 10 foot "q" gages, A total of “7 pressure-time gages and 14 "q" gages were installed for i CHEROKEE). RESULTS Out of a total of 47 pressure-time gages 9 recorded peak COPIED/DOE LANL RC -3- .