To obtain individual tree breakage cata in a region of lon: positive phase durations in order to substantiate the basis for break- age and blow down predictions. 4.3.2 Procedure his project will participate in the Koon shot only. The project fart: will be confined to Uncle Island. There will be no instrumentation-émploying electronics. A tree stand (approximately 1000! x 1000!) will be sélected on Uncle Island by ground survey. Pressures within nd will be obtained from Project 1.2b which will place eight self recording pressure gages in the stand. Q(4u%) forces will be deduced from/tReory and measurements made at other locations by Project 1.3. Snubbers‘(wire from center of pressure on tree stem to a friction grip on a groud stake) will be installed on selected trees for measurements of maximum deflection. A few isolated trees in cleared areas outside the stand will be instrumented and observed for comparison with those within the stand. Static breakage tests will be performed on trees which are typical of those within the stand. There will be ex- tensive pre- and post-shot still photography of the tree stand. 4.3.3 Remarks This will be the first@bservation of the effects of a nuclear detonation on a natural tree ‘stand. From previous experimental work, culminated by observation and‘instrumentation on an artificial tree stand in UPSHOT-KNOTHOLE, a tree breakage prediction system is in preparation (by U. S. Forest Se icé) presenting 90 per cent (severe damage) and 10 per cent (light damagd) levels of probability. Project 3.3 will serve as a test of thispeedietion theory. id il tii a z F r th £ 35