Thaler explained his plans for instrumentation. shot in deep water, positioning would be something as in the sketch, with two strings, eight pressure-sensing elements per string, enabling a For the surface LU cr depth) sPrriioceft from a region 200 ft /1000 ft (the interesting vegice for‘eitmarines). Barge n *. ee Instrumentation For the 1¢goon measurements, they would participate in the shot recammended by LiSL ids a good one, using a series of stations (probably three, possibly four) which would contain probably six to eight pressure- sensing elements peristation, and in addition employing ball crusher gauges for peak pressure. i The pressure-spriing elements would be mounted on tuna cans (weight ~ 1 ton aplece),“d gets back to ‘iashington. He added experiment if they chose the since the water there is so Aronson stated that NOL to this measurement to get more da 1.6 f which will begin just as soon as Thaler that he would be um-illing to do this location (north of Bikini) for the shot, twould mean woricing in 9 or 10 ft swells. ~considering adding 2 munber of channels ints. Acoustic Pressure Signals in he - (ONR) mt invoalyes no personnel nor instruThis is an off-site experiment; mentation in the Water “‘ave Studies - (ONR, NOL) iJ Interest is in such measurements in bot} deep and shallow water also for some measurements going up a beach. ce eae and ic mao 1.7 Atolls. rey i po 1.8 Close-in Ground Accelerations (SRI, BRL, Candi) Everyone is agreed this should be very limites;“but.should be done. ~23~