Figure 1. Cylindrical test chamber with assembled control panels inside. The end 

 plate with membrane filter is shown at right. 



pH of seawater samples inside and outside the test chamber were found to be 

 identical. The test specimens which were placed inside these test chambers 

 were intended to serve as control panels.* 



2. Covered with a 21 0-mesh nylon screen cloth. Nylon screen cloth 

 was placed between two plastic end plates that were cemented together along 

 the edges, and these end pieces were sealed with silicone adhesive and attached 

 to the cylinder with machine screws. Only microorganisms and larval forms 

 of marine organisms can pass through the nylon screen cloths. The flow of 

 seawater (currents) through the screen is very slight. 



3. Uncovered. The plastic end plates without any coverings were 

 placed over the ends of the test cylinder primarily to retain test specimens 

 inside. The test panels would be subjected to fairly strong currents flowing 

 through the uncovered ends and to attachment by various marine organisms. 



These specimens became contaminated with bacteria, as is discussed later in this report. 



