APPENDIX B. SECOND PROGRESS REPORT 



Code 5401-BEO/bah 

 23 July 1958 



MEMORANDUM 



From: Committee on Instrumentation 

 To: Deputy Hydrographer 



Subj: Second progress report of the Committee on Instrumentation 



Ref: (a) Code 1000-bla memo of 5 Mar 1958 



(b) Code 5401-BEO/klw memo of 22 Apr 1958 



End: (1) Summary of Progress on Evaluation of Frequency 



Modulated System for Measuring Water Temperature, 

 Salinity, Depth, Transparency, etc. 



(2) Oceanographic Instruments and Systems That Should 

 Be Developed, Evaluated, or Further Investigated 



(3) Summary Notes on Hydrographic Office Magnetic, 

 Gravity, and Depth Measurements 



(4) Present Status of Hydro Field Instruments 



1. Reference (a), which established this Committee, instructed that 

 progress reports would be submitted as warranted by significance. 

 Justification of this report, however, is not so much significance of 

 the work of the Committee as it is a desire to keep in touch with the 

 thinking of top management so as not to go too far afield. 



2. With the assignment of Mr. Larry Brock of the Instrumentation 

 Division to work with the Committee, and as a result of the efforts 

 of others in the Instrumentation Division, the Committee has a better 

 understanding of the problems and expected performance of the system 

 briefly described in reference (b). This work is summarized in 

 enclosure (1). It is hoped that firm recommendations for development 

 of a basic system for measuring water temperature, salinity, trans- 

 parency, depths, and currents can be made in the Committee's next 

 report. 



3. It is recognized at this point that any system providing the desired 

 versatility, accuracy, and dependability will require considerable 

 engineering. Almost without exception, it has been found that newly 

 developed instruments that have been initially reported as glowing 

 successes have later revealed serious defects or limitations. It is 

 the conviction of the Committee that greater progress can be made 

 for less money on some items by doing the basic development work 



B-l 



