to Include among their observations long term anchor stations In 

 suitable locations with closely spaced serial observations of 

 all measurable parameters. One of these cruises, AMOS XI, is 

 now In progress and the data v/111 be available In the very near 

 future. In addition. In cooperation with the Office of Naval 

 Research, plans have been completed for conducting a series of 

 cruises of five days' duration In each month to collect similar 

 data to be utilized synoptlcally with the observations taken at 

 weather ship HOTEL, The U. S, Navy Hydrographlc Office has been 

 very active in improving the instrumentation required for this 

 type of oceanographlc data. The radiation data presented in the 

 first section of this report constitutes one of the first sets 

 of data from a recently developed pyrhellometer array now In- 

 stalled on the U, S. Navy Hydrographlc Office Survey ship REHO- 

 BOTH. New photometric equipment is now being tested with a view 

 to improving methods of obtaining transparency data with depth. 

 In addition, the Hydrographlc Office has developed to a stage of 

 near completion a thermopile to supplement BT observations which 

 Is expected to yield much valuable information on the microther- 

 mal structure of the ocean. This device is of great interest to 

 the present investigators, not only because of its obvious value 

 in estimating very small changes in the thermal structure due to 

 processes such as radiation and evaporation, but also because of 

 Its great possibilities as an instrument for measuring fluctua- 

 tions in teraperatiu^e of a periodic nature. Such an instrument, 

 when held at a constant depth, would give a good indication of 

 these periodic fluctuations; several such units, each at a dlf- 



71 



