1.5610 Bathythermograph. (18,014 



expendable units) 



Purpose: A ship and/or airborne system is needed for 



nnaking temperature-depth, and possibly other measure- 

 ments while underway at high speeds utilizing expenda- 

 ble sensing units. 



Possible method: Drop over side of ship a sensing vehicle 

 with buoyed radio-telemetry unit which would remain 

 on surface. After short interval, vehicle would sink at 

 suitable rate through water sending information fronn 

 depth and temperature sensor to telemetering buoy 

 through gradually uncoiled wire or by sonic means. Sig- 

 nals from buoy would be received and recorded by sys- 

 tem aboard ship or aircraft. Entire expendable unit 

 would sink after pre-determined time. (System would be 

 analogous to radiosounde for atmospheric data.) 



Range and accuracy: 



(1) Temperature: -Z° to 35° C. ±0.1°. 



(2) Depth: to 300 m. ±1. 

 Specifications and requirements: 



(1) Sinking rate: 1 mi. /sec. ±0. Z. 



(Z) Response time of sensors: 95% in 1 second. 



(3) Range of radio transmiission: 5 miles. 

 Cost of expendable units: Not to exceed $30. 



1.5620 Thermographs. (316) 



Purpose: There are several different types of thermographs 

 available but there is a need for one which is quite 

 small, light, and above all, inexpensive. 

 Range and accuracy: -2 to 30 C. 0.5. 

 Specifications and requirements: 



(1) Duration: 200 to 400 days. 



(2) Depth: to 400 m. 



(If these units could be produced for less than $100 each, 

 preferably less than $50, they could be thrown over- 

 board on the fishing banks relying on fishermen to re- 

 trieve them for a suitable reward as with tagged fish.) 



1.5700 TELEMETERING SYSTEM (20) 



Develop a telemetering system which does not require an 

 insulated cable. Multiplexing on the uninsulated trawl 

 wire or improved sonic modulation might be investigated. 



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