static bending tests at the proving grounds. Following ASTM standards small clears were cut and subjected to tests in the materials testing laboratory on Elmer Island (Eniwetok Atoll}. From force-deflection data, strength characteristics were calculated. Table 2.3 presents average valués of fiber stress at proportional limit, modulus of rupture, and modulus of elastisity for the three palm and Pisonia test specimens. Similar values for typical American woods are given for comparison purposes. ‘ 2.6 PHOTOGRAPHY To fix the undamaged appearance of sample plots; snubber trees, and the tree stands as a whole, extensive still ground photoyrephy was made prior to Shot 1. Low cblique aerial photographs were taken at intervals along the center pressure gage radial across Uncle Island stand. These views when repeated post-Shot 3 allowed assessing damage in terms of stem and branch breakage and defoliation, and the effect of tree position in the stand. TABLE 2.3 - Comparative Strength Properties of Falm and Pisonia with Typical American Woods we a Common and Botanical Name (Cocos nucifera) a (Pisonia grandis) American beech b (Fagus grandifolia) Douglas-fir? (Pseudotsuga taxifolia) b aga; (Acer a a 2 &§ nein oo ’ ps saccharinun) mapie -~ 82 61 @ O43 ort 2s SB “~ oF sb OS]4) 2°44 #25 38, LHS ERBa0) “ene aR -“ A, f&, 6n 7 3387 342 Sho 3&4 — eo ~ +35 1,00 3,600 243 +25 1,700 2,300 305 24 296 45300 8,600 1,389 36 “49 4,800 7.600 1,350 92 -36 3,100 > ,000 970 66 24 3,100 5,800 940 , average of three :spec . ; eS 209 , Pinus ponderosa) ob.ver ° Aas Coconut palm & Ponderosa pine a> <n of Species Pisonia . ®ty ~ ot / 370 ~ “ Wood Hanabeck, Forest Products Laneratory, Forest Service, USDA. eune, di. 25 SECRET- RESTRICTED DATA