1212 
-2<= 
the oressure to fall to i/e of the maximum pressure) are given as oercentages of the values for 
the single charge. The equivalent weignt of the charge is the weight of a normal charge which 
would oroguce the same effcct as the multicle charye, using the laws. 
Maximum oressure = Ky yi/3 
momentum = Ks w2/3 W = weight of charge 
Energy = Ks W 
. 
TABLE 1. Value of maximum pressure, momentum and energy for multiole charge 
of 2, 3 and 4 times 14 lbs. T.N.T. 
No. of Dist. Energy (f o%dt) 
units in be 
Multiole tween 
charge units 
Equiv, Equiv. Equiv. 
weight weight weight 
of of of 
charge charge charge 
ins. 
It is considered oossiple that cnly 3 of these charges detonated. 
Theoretical considcrations. 
The oressure oulse from an exclosive charge consists of a very rapid rise to a maximum 
oressure followed by a more yradua) fall of oressure to zero. 
As a fair aooroximation the pulse 
at distance 0 ft. from W lbs. of T.N.T. may be taken to he 
=nt 
Bie TRI ,»o= Do t=o 
o =o tso | 
4/3 
with —p, KW and & c/w! J 
where p is tne sressure, t the time, W the weignt cf charge, D the distance from the charge to 
tne point in question and kK, ¢ are constants. 
If the charje of weight W is realaced by a Charge of weignt 8 W the oulse becomes 
- t 
P= 2i0%e 2 DF OF 
° o’ 
Tele sees 
