Therefore, parallel development of more accurate temperature meas- 

 urement and improved circuitry design should be undertaken. 



If theory and the results of laboratory tests of the induction- 

 conductivity-temperature indicator are borne out in field operations, 

 the complete abandonment of all electrode-type equipment probably 

 would be justified. 



For the laboratory, bridges constructed by the Woods Hole Oceano- 

 graphic Institution and the University of Washington have proven to 

 be reliable and accurate instruments. Further improvement should 

 be directed toward individual components and reduction in size and 

 weight. The Russian interferometer appears to be a significant achieve- 

 ment, particularly because of its complete freedom from electronic 

 complications . 



E. RECOMMENDATIONS 



It is recommended that the fabrication, calibration, and field testing 

 of the induction-conductivity-temperature indicator now underway by 

 the Hydrographic Office proceed without deferment. 



It also is recommended that consideration be given toward making 

 the conductivity bridge (salinometer) a more portable instrument. 

 This might be achieved by miniaturization of portions of the circuitry 

 and by packaging the total equipment into several components which 

 would be individually more portable. This is being investigated as is 

 the Australian equipment which may meet the requirement. 



It is recommended further that the Hydrographic Office continue 

 its investigation of the reported accuracy of the Soviet interfero- 

 meter and the feasibility of acquiring or building such an instrument 

 that would equal the claims made by the Soviets. 



Finally, it is recommended that this Office keep abreast of the 

 development of the beta particle absorption technique. 



F. SELECTED REFERENCES 



IV- 1. BEHAR, M. F., ed. Handbook of measurement and control. 

 Instrumentation and Automation, vol. 27, no. 12, Pt. 2, December 

 1954. 216 p. 1954. 



IV- 11 



