10 



20 



30 



40 



50 



10" 20'' 30" 40" 50" 60" 70" 80" 90" 100" |I0" 



30 40 



Minimum duration, t^i^, in hours 



0.9 0.8 07 06 05 0.4 



03 02 OI5 



01 0.09 O07 0.06 0.05 



EXAMPLE: U-29 KNOTS, V 28 HOURS, F ■ 600 NAUT. MILES, H," 16.7 FEET, T^ "8 2 SECONDS, 

 0'600 NAUT. MILES, H o /Hp • 0.40 . Ho ■ 6.7 FEET, Tp- 11.6 SECONDS, T(,-34 HOURS. 



PLATE VIII. NOMOGRAM FOR WAVE GENERATION AND DECAY 



