DETONATION OF MICH KXPI.OSIVKS <>l; I!Y TIIK IMPACT <K P.l'l.l I I : 



stoppage, the pressure at any time is \v * where X is the mass per unit length at the 

 section which is undergoing stoppage at the time. The pressure-time curve, calculated 

 in this way, is shown in fig. 7, in which the ordinates are proportional to the values of X. 

 This is the same curve as that giving the distrihution of mass along the length of the 

 bullet, the abscissa scale being such that the length OF within which the impact is 



.MIDI III 



40000 



^3001)0 



zo.ooo 



10,000 



Rg.7 



- 



Time , M' s 3a. 



t 



F 



complete is equivalent to the time required by the bullet to travel its own length 

 (1'25 inches) at a velocity of 2000 feet per second. This is 5'2x lQ- seconds. The 

 maximum pressure corresponds to the maximum value of X (0 35 Ibs. per foot) and is 



Pj35_x2000x200p 

 32'2 



= 43 



This difference is 



which is 2 per cent, in excess of the value found by experiment, 

 no more than can be accounted for by errors of observation. 



The momenta which should according to theory be taken up by various lengths 

 piece are readily calculated from this curve. For instance, that corresponding 

 3-inch piece is the area ABODE. The following table shows the results a 

 with the corresponding observed values. The momenta are reckonec 

 of the total : 



3 L 2 



