Figure 2. The U. S. Navy Electronics Laboratory Oceano- 

 graphic Research Tower located a mile off Mission Beach, 

 California, in 60 feet of water, where turbidity study was 

 conducted. 



TOWER 



The turbidity measurements were made from the USNEL 

 Oceanographic Research Tower (fig. 2). The tower is used 

 to carry on shallow -water oceanographic research on waves; 

 on acoustic, chemical, and biological properties of the sea; 

 and on their interrelations. 



The underwater part of the tower consists of large pipes 

 welded together. This structure causes little interference to 

 the waves and flow of water. On three sides of the tower are 

 nearly vertical railway tracks running from the main deck to 

 the bottom 60 feet below the surface. On the tracks, cars 

 containing sensing instruments may be lowered and raised. 



