™ steel beams and pipes attached to these structures were damaged and destroyed by overpressures of 11 psi and greater. 5. Smali buildings covered with thin sheet metal over diagonal wood sheathing generally withstood overpressures up to 5 and 6 psi. However, one structure of this type was observed btal itedddd de £ bis Tr badly damaged by an overpressure of 4.5 pai. 6. Lightly constructed wood-frame shacks apparently sheathed with corrugated metal and located in regions with overpressures yreater than 4 pst were completely destroyed. No structures of this type were observed in rogions subjected to less than 4 psi overpressure, 7. Palm trees were destroyed by air~blast overpressures of 4 to § psi and greater, but none were destroyed by overpresaurea less than 4 psi. 4 SECKET— RESTRICTED DATA a a 7q . OY LST, FE REITNTI, seal om, Laping BS a Be En eee ea ‘ _. YT Yr