ASSIGNMENT 



Examine and make recommendations for: An orderly program of 

 modernization of instruments for field measurements of all forms of 

 geophysical data of interest to the Hydrographer, associated data record- 

 ing and conversion devices necessary for use either in the Office or the 

 field, and the methods and form of storage of this data. 



GUIDES 



1. Apply established engineering principles and components which 

 have been developed in other fields. Aim for improvements in accuracy, 

 ease of operation, consistency, and decreased time at all stages of 

 operation. 



2. Contact civilian and governmental activities and laboratories. 



3. Consider the nature and amount of data in question and the 

 computation process it will undergo. 



4. Prepare practicable timetable. 



5. Retain equipment in use where practical, and specify proven 

 equipment or components otherwise. 



FACTORS TO BE MEASURED 



1. Position 



2. Range (acoustics work, visibility, electrical and magnetic fields) 



3. Depth (depth of instrument and depth to bottom; also depth to 

 different layers of sediments) 



4. Time 



5. Oceanographic Factors 



a. Temperature 



b. Salinity 



c . C onducti vity 



d. Density 



e. Sound velocity 



f . Sound attenuation (scattering and absorption) 

 g. Ambient noise level 



A-i 



