Relative Importance to U. S. National Oceanographic Program: 

 Individual instrument/equipment priority 16. 



I.q. SEA FLOOR GEOTHERMAL PROBE 



Primary Use: 



To be utilized on oceanographic survey ships, with the ship 

 stopped ( "iying-to"), to measure the heat-flow characteristics and 

 values across and within the sea floor sediments. 



Requirements and Specifications: 



a. To be utilized during stopped ("lying-to") operations. 



b. To perform reliably and accurately in water depths of to 

 6, 500 fathoms. 



c. Instrument should be simple in design and construction, 

 rugged, and easy to transfer from one ship to another for reinstal- 

 lation. Modular sensors could be attached to the long and short 

 sediment corers of the Sea Floor Sampling System. 



d. Data to be measured: 



Data 



Heat Flow Range: to 10 microcal./cm. /sec. 



Accuracy: 0.05 microcal. /cm. / 

 sec. 

 Temperature gradi- Range: to 0.6 'CT. /m. 

 ent Accuracy: 0.001 C./m. 



Temperature Range : to 5° C. (0 to 20 feet) 



Accuracy : 0.001° C. 

 Range : 0-10° C. (0-100 feet) 

 Accuracy : 0.001° C. 



Depth of probe Range: to 20 feet 



(corer) in sea to 100 feet 



floor Accuracy: 0. 1 foot (or measured 



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