and from the SURFACE 



Nansen bottle is attached to wire to ob- 

 tain temperature, pressure, and water 

 sample at predetermined depth. 



> 



Biologist uses a light transparency meter to measure 

 turbidity in the waters of Galveston Bay, Tex. 



Bathythermograph makes quick record of temperatures 

 at different depths. Data are useful in finding fish. 



25 



