. Deep-ocean biodeterioration of materials. Materials; Marine sediments. Figure 20. Phenolic laminated plastic sheet damaged by borers in an area which was in contact with wood. Compare size of damage to l/4-inch-diameter bolt hole. The surface of the phenolic laminated plastic sheet where the wood panels were attached was damaged by these borers (Figure 20). The borers had attacked the wood first and had then continued to bore into the plastic. Deep sea fungi were not found in any of the l/2x2x6-inch panels which were exposed about 3 feet above the sediment layer. However, the surfaces of the
. Deep-ocean biodeterioration of materials. Materials; Marine sediments. Figure 20. Phenolic laminated plastic sheet damaged by borers in an area which was in contact with wood. Compare size of damage to l/4-inch-diameter bolt hole. The surface of the phenolic laminated plastic sheet where the wood panels were attached was damaged by these borers (Figure 20). The borers had attacked the wood first and had then continued to bore into the plastic. Deep sea fungi were not found in any of the l/2x2x6-inch panels which were exposed about 3 feet above the sediment layer. However, the surfaces of these wood panels were slightly deteri- orated by bacterial action. The 2x4x30-inch untreated fir bait pieces which were fitted over the plastic rods and tubes were deteriorated by borers. The heaviest damage was confined to the bottom side of a bait piece exposed right next to the sediment (Figures 21 & 22). Generally the large bait pieces were in fairly good condition, because the borers had not had time to penetrate deeply. On the other hand, the l/2x 1 x 10-inch bait pieces which were fitted over the electrical cable insulations were heavily damaged. The interior of the wood was completely destroyed, leaving a thin outer shell. These wood bait pieces could easily be broken in two or crushed with one's fingers. A 3/4x3x 36-inch untreated plywood specimen was exposed between 5 and 8 feet above the mud line. As expected, the damage by the borers was very light compared to wood exposed near the mud line (Figure 23). At the lower end of the plywood board were attached clusters of egg sacks of some unknown marine animals (Figure 24). 22. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Muraoka, James S; Naval Civil Engineering Laboratory (Port Hueneme, Calif. ). Port Hueneme, Calif. : U. S. Naval Civil Enginee
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