PERMANENCE 



The stability and fixed location of 

 the tower make it useful for studies that 

 could not be accomplished economically 

 or efficiently from surface craft. An ex- 

 ample is the making of long-term mea- 

 surements. Many of the instruments 

 mounted on or adjacent to the tower struc- 

 ture are capable of continuously recording 

 oceanographic variables. Examples are 

 shown on this and the following page. 

 These instruments can operate unattended 

 day and night under all weather conditions. 

 The long-term data recordings obtained, 

 covering weeks and months, are used to 

 identify and measure cycles not registered 

 by short-period observations. 



Because of its permanency, fixed 

 location, and continuous operation year 

 in and year out, the tower permits opera- 

 tions to be scheduled and planned more 

 easily and efficiently than would be possi- 

 ble with movable surface craft. 



, , I I I I I I.! I I I I I 1 1,1 I I t %f 



ruAM' 



/^vV^^^w-^ 



Time vs depth recording from iso- 

 therm follower. 



Data system that records and prints on 



punched tape temperature sensed by 



thermally lagged thermistor beads on 

 tower leg. 



14 



