® wih eo 1161 Blast Mtg Notes, 29 Dec 31 K. Water Wave Motion LASL has agreed to make this measurement. The technique to be used here is not as yet clear: photographing a light on a float or some- thing of this nature has been talked of. So far, we have tentatively arranged arranged for cameras on Rigili and Parry, and there has also been some talk of a recording instrument that could be placed at other points. It is felt that results would be more meaningful fram deep water, because this is a homogeneous medium, and that there is not much point in many instruments in the shallow lagoon. Ogle did not think measurements Just in the region of Rigili and Parry sufficient. He felt there should be some point only a mile or so away from zero. However, the cameras must be 4,000 - 5,000 yds away, and even then fall-out may affect then. George White, of T-Division, has been making a study of water waves and should have a report out in a week or so. It was agreed that the decision on station positions will await the issue of this report. In the meantime, it was suggested that J-10 consider some methods of observing $ wave motion which are independent of photography. Incidentally, White has said it appears there will be a wave on Parry of amplitude about 3 ft. L. High Altitude Waves J-10 has agreed to inycstigate methods of measuring this phenom~ enon. Again, George White plans to look into what might be expected as soon as he finishes the water wave study. Until this has been done, it is difficult to say what instrument should be used. For getting the gauge up in the air, Zadina had thought of the high-altitude, cosmic-ray type of balloon. Telemetering would probably be required for getting the information back, since recovering the baloons at some future time from stations spread around the Marshalls does not look hopeful. Zadina believes it does appear probable that if the bomb goes at 10, 15, 20 MI, waves will occur in the upper atmosphere similar to waves in water. An accelerometer may be able tc measure these disturbances. The eruption of the volcano Krakatoa, (see Fig. 3) which according to G. I. Taylor's calculations had anenerey release of about 500 MT distributed over a very \ “NEE “Ex.nee Fig. 3