vary acceptable for a weight of stones that, as has been indicated 

 can range downward from 1000 kg to a small weight, and whose in- 

 dividual stones of weight less than 14-3 kg placed near the upper 

 part would descend down the slope, so that by this process, and 

 surely without subsidence of importance, the surface would become 

 constituted of stones of greater weight. 



The necessary weight of stones at the foot of the dike, where 

 the height of virtual wave is 0.39 m, would be only 



P = 15 x 0.39 3 x 2.7 = 5.6 kg. 



The theoretical profile is obtained in this way and is 

 indicated by the broken line in Figure 3, whose approximation to 

 the real profile is already very satisfactory. But, if instead 

 of adopting as height of incident wave its upper limit H= 7 m s 

 deduced from oscillations of the buoy, we assume the maximum 

 height of wave of 9 m adopted by the engineers of Argel, we ob- 

 tain Table 2, similar to the preceding and corresponding to a 

 height 2 hp = 6.45 m, determined after several trials, so that 

 the maximum height of wave on breaking should be the 9 m cited. 



Figure 1' similar to Figure 1, confirms that, in effect, 

 the height of wave at breaking is 9.05 meters, that is, practically 

 the same as 9 m. 



In Figure 2' similar to Figure 2, are determined the height 

 of virtual waves, A', corresponding to the various depths, in 

 which, again by analogous procedure, we obtain the following 

 batters; 



For the surface slope of 50 ton concrete blocks 



7 



ctoc - 1 = 9.05 3 / l9 x 2.4 - 0.6a 

 Vl + ct2oc 1 '^ V 50000 



whence, the batter should be ct a = 3.04- 



For the rock fill of artificial blocks situated below the 

 depth H r = -5m: 



ct oc - 1 = 5.0 5 f 

 Vl + ct 2 a 1.4 V 



19 x 2.4 = 0.346 

 50,000 



whence the batter should be ct oc =1.68 



For the natural rock fill situated below H r = -11 m; 



16 



