accuracy, and the means of simplifying and improving the records it 

 gives. Develop new means of accurately measuring low- velocity currents. 



8. Make inquiries of oil- drilling equipment companies, marine instru- 

 ment designers, and oceanographic institutions as to the best means of 

 insulating and waterproofing cables, cable connections, and instruments 

 under pressure in sea water. (This appears to be a major factor in the 

 reliability of any instrument and warrants separate investigation). 



9. Study the various methods for ranging between vessels and buoys 

 over distances of 10 to 4,000 yards. 



10. Determine the requirements and potential applications of bottom 

 photography and underwater television. 



1 1. Investigate the availability of portable pyrheliometers and long- 

 wave radiometers. 



12. Follow the progress on development of expendable acoustic devices 

 (noise- makers) by NRL. 



13. Explore the means of transmitting and converting coded messages 

 directly onto punch cards or other storage media. 



14. Explore the desirable configuration and instrumentation of aircraft 

 for oceanographic and other geophysical measurements. (This is a 

 problem of the future but one being approached through the development 

 of the airborne radiation thermometer, radiometers, and wave recorder 

 and through the use of aircraft for magnetic measurements and ice 

 observations.) 



B. Surfacing Temperature-Depth Probe 



The Woods Hole Oceanographic Institution reports that it has designed 

 and used successfully a device that telemeters depth information through 

 water. The advantage of this device is that it eliminates the need for 

 electrical connections with the surface. If this device were combined 

 with a temperature element and other sensing or sampling elements, and 

 a release mechanism, and were made buoyant, the need for any cable 

 connection could be eliminated. The device could be weighted and the 

 release mechanism set to drop the weight at any desired depth. It could 

 then be recovered after surfacing. The advantages of this instrument 

 would be: 



a. No requirement for winch or cable for operation 

 Encl. (2) to Code 5401-BEO/bah memo of 23 Jul 1958 



B-8 



