262 -16- 



Let D be the distance of the center of the explosion from 

 a point 33 ft. above sea level, so that P = PgD • It is 

 still necessary to express the energy constant E In terms 

 of the mass of explosive. For the case of T, N. T» , experi- 

 mental results indicate that E is approximately one-half of 

 the total chemical energy released by the explosion. See [4], 

 Slight changes in E will not materially affect the results 

 since E appears in the form \/W» Using the values given 

 by G» I, Taylor in [3], p. 4 , and converting to the English 

 system of measurements, one finds that 



L = 13.2 \/^ feet, 



(2.8) 



C = 2«85 — ir»? seconds , 

 ^o^ 



where W is the weight of T. N. T. in pounds, and D^ is 

 the distance In feet of the center of the explosion from a 

 point 33 ft. above sea level. 



Likewise, making use of the experimental values given 

 by G. I. Taylor in [3], p. 4 , the quantity ^^^ for T. N. T. 

 is, in metric units, 



1/4 



^ = 



1.183M 



A 



where M is the mass of T. N, T. in grams. Changing to 

 non-dimensional variables, one obtains 



where k = 



1/4 

 1.183M ' 

 Si , 



cm 



3/4 



