-33- 279 



pressure Is obtained by setting s = 0, with the result 



d - b_ = 



Expressing d in descending powers of b , we get 



(3.13) d = 6.2 b^ + 3.3 b + .4 . 



A graph of equation (3.13) is drawn in figure 2. 



More generally, the peak pressure, as a function of 

 the distance b^ of the mine from the sea bottom, is 

 obtained by combining equation (2.28), (2.29), figure 6, 

 and equation (3.12). As a typical example of this dependence, 

 consider the case discussed in section 3, part I, of a mine 

 containing 1500 lbs. of T. N. T. in water of depth 150 ft. 

 The scaling factor L, as obtained from figure 1, is 



L = 27.6 ft. 



The depth D of the sea bed from a point 33 ft. above sea 

 level Is 183 ft., so that 



d = ^ = 6.63. 



The best location of the mine according to figure 2 is 

 b^j = .76, or 



B = Lb„ = 21 ft. 

 o 



above the sea bed. 



