l6 Petavel, High-Pressure Explosions. 



EXPLANATION OF PLATE 10. 

 Fig. 3. Rise of pressure during tiie explosion. 



Spherical enclosure capacity, 55i'9i c.c. 

 Temperature of enclosure : before firing, 18° C. 



„ ,, ,, : after firing, 24° C. 



Initial pressure 77-3 Atms. (1,136 lbs. per sq. in.) 

 Maximum explosive pressure = 647 Atms. (9,508 lbs, 



per sq. in.) 

 Ratio : Air to gas = 6-o. 



„ : Explosive pressure to initial pressure = 8*4. 



Fig. 4. Fall of pressure offer the explosion. 



Spherical enclosure capacity, 551 '91 c.c. 

 Temperature of enclosure : before firing, 2 1 '^ C. 



„ ,, ,, : after firing, 27" C. 



Initial pressure, 74*38 Atms. (1,094 lbs. per sq. in.) 

 Maximum explosive pressure, 654*2 Atms. (9,618 lbs, 



per sq. in.) 

 Ratio: Air to gas = 5 71. 



,, : Explosive pressure to initial pressure = 8'8. 



