SIR ANDREW NOBLE: RESEARCHES ON EXPLOSIVES. 



227 



Comparing the times of burning of 0'2 cordite and rifle cordite, the times are 

 approximately as follows : 



The rates of cooling of cordite (charges and densities being as stated) are shown in 

 Plate 12, the interior surface of the explosive vessel being 54'9 sq. inches (354'3 sq. 

 centims.). The communication of heat to the vessel is extraordinarily rapid. The 

 pressure and approximately the temperature of the exploded gases is in the case of 



Density O'l (32 grammes) reduced to one half in 0'87 second, and to one quarter 

 in 270 seconds. 



Density O'l 5 (48 grammes) reduced to one half in 0'93 second, and to one quarter 

 in 2 '8 2 seconds. 



Density 0'20 (64 grammes) reduced to one half in 1'54 seconds, and to one quarter 

 in 3 '8 3 seconds. 



Density 0'25 (80 grammes) reduced to one half in 2'40 seconds, and to one quarter 

 in 6 '04 seconds. 



1020'6 grammes of the same cordite fired at a density of O'l in a vessel whose 

 interior surface was 3271 sq. centims. reduced its pressure to one half in 3'1 seconds, 

 to one fourth in 10 seconds. 



1247'4 grammes fired at a density of 0'12 in the same vessel had the pressure 

 reduced to one half in 4'2 seconds, and to one quarter in 13'8 seconds. 



1360-8 grammes fired at a density of O'l 31 in the same vessel recorded a pressure 

 of one half in 6 '3 seconds, and of one quarter in 31 seconds. 



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