FIGURES (Cont'd) 



Page 



20. Longitudinal Flow Velocity Spectra for Different Relative Headings 



Under Hovering Conditions, Run 5 . . . 36 



21. Longitudinal Flow Velocity Spectra for Different Relative Headings 



Under Hoverjng Conditions, Run 6 . . . . « • 37 



Al . Block Diagram of The Analog to Digital Recording System Used by 



The Submarine Systems Section .................. 51 



A2. Fraction of a Unit Simple Harmonic Wave Height Remaining at 



Depths of 75 and 100 feet .................... 53 



B'l. Compressed Re-recording of In Situ Pressure Fluctuations ....... 58 



82. Comparison of Power Spectral Estimates of Filtered and Unfiltered 



Signals, Run 4-4 ........................ 59 



B3. Band Pass Response of The Model 330-A Krohn-Hite Ultra-Low 



Frequency Band-Pass Filter .................... 60 



B4. Power Spectra of In Situ Pressure Fluctuations Compared to 



Attenuated Surface Wave Height Spectra, Run 4-4 .......... 61 



TABLES 



1. Test Conditions During Cruise II, USS REDFIN - 28 October to 



1 November 1959 ........................ 7 



2. Ninty Percent Confidence Intervals for Digital Spectra of Surface 



Wave Heights .......................... 26 



3. Ninty Percent Confidence Intervals for Analog Spectra ........ 27 



4. Summary and Comparison of Results Derived from Surface Wave 



Spectra (Digital) and Hindcasting ................. 38 



5. Summary and Comparison of Results Derived from Roll Angle Spectra 



and Manual Computations 40 



6. Summary and Comparison of Results Derived from Transverse Relative 



Flow Velocity Spectra and Manual Computations ........... 41 



7. Summary and Comparison of Results Derived from Longitudinal Relative 



Flow Velocity Spectra and Manual Computations ........... 42 



vii 



