3. Itest Board No. 3 (USMI-7) . The depth of water vhere this 

 test board was Installed was 27 ft below low water. The board was 

 installed with its top at a depth of 19 ft and its lower eftd at a depth 

 of 25 ft below low water. The tidal range, temperature, and pollution 

 were the same as data given for Test Board Wo. 1. A sample of water 

 taJcen in the immediate vicinity of the test board on January 5, 19^5, 

 contained 135 PPm of salt. Further data on the temperature, salinity, and 

 pH reaction of the water at these locations are given in the tables below. 



h. Water Temperature . The following record of water tempera- 

 ture in degrees F, from readings made at various times each month, shows 

 the general range throughout the year at each location. 



187 



