1 = &■ + - 



T v g 



whose slope, i, or theoretical limiting batter l/i, is a function of 

 period 2T, which, for each depth H, fixes the length through the 

 expression 



V? 



. L x Cth 7T H 



L 



but said limiting slope is likewise a function of the height of the 

 wave, 2h. 



Lately, there came to our attention a report, presented like- 

 wise by the representatives of the Laboratory of Delft, to the third 

 meeting in Grenoble of the International Association of Investiga- 

 tions for Hydraulic Works, in which were described with great detail 

 the experiments made and the results obtained. 



In the graph shown in Figure 1, which refers to continuous 

 batters (constant slopes), presented in Grenoble, the ordinates re- 

 present the relation h^/h between the semi-heights h]_ of the reflect- 

 ed wave, and h of the incident, and the abscissas are the relation 

 t/2L between the horizontal dimension t of the batter and the length 

 of the wave 2L, 



It is emphasized that this second variable is not adequate, 

 but that what we might call the factor of damping hi/h would depend, 

 as in our formula, not on the arbitrary relation t/2L, but on the 

 slope H/t, or its reciprocal the batter t/H° 



Thus, logically it comes out that, passing to this new variable, 

 by means of the simple expression 



t = _ t x 2L 

 H 2L H 



we obtain the graph of Figure 1' , in ■which the aggregation of points 

 turns out even better grouped than in Figure 1, 



Using the data out lira d in the cited report presented in 

 Grenoble, from the extreme observations we obtain the following data 

 and their corresponding results. Intermediate results would come 

 from intermediate conditions.. 



Waves Classified Short 



(a) 33a ta. 



Semi-period, T = 0,-45 sec; depth, H » 0.3 m.; length, 2L - 



