sea (represented in Fig. 5» Chapter I) is in fair agreement with 

 the results for high fetch parameters, but these observations are 

 not plotted on the diagram. The data used for comparison of theo- 

 retical results in the graph are special observations made aboard 

 the "Heidberg" at well known fetches as mentioned above, and also 

 some other data used by Sverdrup-Munk, But the difficulty with the 

 latter data is that it is not known what the given p-values, or 

 periods, mean (average values or maximum values of observed c (or T) 



at a given v). Most of them are placed into the part of the graph 



/ 2 4 

 with gx/v >10. , where, depending on the wind velocity, a fully arisen 



or nearly fully arisen sea is to be expected. The observations of 

 Stanton and Gibson at low fetches are separately indicated. The 

 "Heidberg"- observations, and well defined other data for higher 

 fetch parameters in the region of the straight lines are stated to- 

 gether with the wind velocity in nv/sec. 



The curves in figure 24 give the sta g e of growt h, and the stra ight 

 lines the fully aris e n state of dominating waves. Thus, on the right 

 hand of the curves fully developed waves are to be expected. The 

 other graphs (figures 25 and 26) are to be interpreted similarly. 

 The representation of data at low fetches by means of S" /(5" = cp(gx/v ) 

 in Figo 25 shows the different relations at different wind velocities.* 

 The complete set of "Heidberg"-observations of partially developed 

 waves was divided into three parts, comprising the observations at 

 wind velocities lower than 1,5 m/sec, between 7 m'^ m/sec and 15 m/sec 



* T is the period of waves observed at limited fetches, and T is the 



period of the fully developed 3 -wave as given by formula (5!a) in 



Chapter I. The ratio T/T corresponds to the ratio (T /C , where 

 C = gT/2Tr and 0- = gTy2fi'. 



m- 



121 



