50 



THEORY OF SEAKEEPING 



\Z 



24 30 3G 

 Windwirkungsdauei 



54 S+d. 



Fig. 5 3 



Relationship between wave heights and wind duration at wind speed of 26 knots. Labeling of co-ordinates] 

 is same as in Fig. 52. Dots indicate weather-ships' observations (from Walden, 1953/54) 



100 



700 900 1100 



Ldnge der Windbahn ■ 



TOO Sm 



Fig. 54 Relationship between fetch and wave height at wind speed of 30 knots. Ordinates and abscissas are 

 significant wave heights in meters and fetches in nautical miles, respectively. Walden's summary of weather- 

 ships' observations is shown by dotted line labeled "Schiffsbeob " (from Walden, 1953/54) 



900 Sm 



Fig. 55 Relationship between fetch and wave height. Labeling of co-ordinates is same as in Fig. 54. Dots indicate 



weather-ships' observations (from Walden, 1953/54) 



