J. E. Petavel 



Phil Trans., A, vol. 205, Plate 21. 



i I I I r i i i 

 ' > I 



0-015 0-010 0-005 



Time in seconds. 



Fig. 1. 



Cordite 0-035 inch diameter. 

 Gravimetric density = 0'0744. 

 Charge uniformly distributed in spherical enclosure. 



-on 



-02 -01 



Time in seconds. 



Fig. 2. 



Cordite 0-175 inch diameter. 

 Gravimetric density =0-099. 

 Charge uniformly distributed in spherical enclosure. 



0-03 



21X10 



i ' r 



-02 -01 



Time in seconds. 



1500 



1000 



o 



0-03 



-02 -01 



Time in seconds. 



Fig. 3. 



Cordite 0-175 inch diameter. 

 Gravimetric density = 0'15. 

 Charge uniformly distributed in cylindrical enclosure. 



Fig. 4. 



Cordite 0-175 inch diameter. 

 Gravimetric density = O'lO. 

 Charge concentration in one half of the cylindrical enclosure. 



N.B. The above figures are reproduced full size from the original negatives. The series of lines which cross the records in a 

 direction nearly parallel to the axis of time correspond to successive portions of the cooling curve. They represent the pressure 

 after 1, 2, 3, &c., complete revolutions of the chronograph drum. In most cases the light was cut off and the record stopped less 

 than a second after the explosion, thus leaving the lower part of the diagram clear. 



