Blast Mtg Notes, 29 Dec 51 4. Phenomenology a. b. c. ad. Temperature vs time (pre~-shock) - (NRL) Density vs time (8 densitometer) -(LASL) Pre-shock changes in pressure (perhaps with microbarographs) - SC Acoustic interferometer -(LASL ) l-a and l-b are duplications, to be sure, but are planned since this offers such a good chance to get a free-air curve. l1-b is essentially a dress rehearsal for Ivy. The division of effort among the agencies indicated--NOL, LASL, 8, NRL--is8 purely tentative, and has not been worked out in detail. For example, we have no definite commitments with NOL for work on Snapper, and this must be discussed further. It was Porzel's feeling that because of the pressure from the services for these data, independent measurements by both NOL and sC are desirable. Too, he doubted that LASL or SC have the necessary effort to make the rocket measurement, so suggested NOL for that also. $ The general instrumentation plan is as follows (for an air drop): -_> White, non-dusty area Asphalt area A dusty area and a stabilized area would be presented to the blast wave. If the plan above were followed, NOL and SC would have three blast lines each. The group were not in agreement as to the desirability of complete duplication in the surface pressure-time measurements. If one could ignore the political implications, it would certainly not be necessary, and may even be less desirable than one set of very good measurements. This, as well as NOL's participation in future J work, will be discussed again in detail. Notes Edited By: W. E. Ogle:djw:ak SNL (37