210 Capt. Sir A. Noble. [June 21, 



III. Results of the Analyses of Strand Gun-cotton when fired in a 

 Close Vessel by Detonation. 



Pressure* per sq. inch. 



A^ 



^7 N 



1 ton. 3 tons. 



C0 2 (vols.) 19-21 29-08 



CO 41-25 32-88 



H 23-07 20-14 



N 16-21 17-50 



CH 4 0-26 0-75 



IV. Similar Results for Pellet Gun-cotton. 

 Pressure per sq. inch. 



3 tons. 10 tons. 



C0 2 (vols.) 25-76 26-50 



CO 39-34 37-48 



H 18-71 20-97 



N 16-19 15-05 



CH 4 Nil Nil 



V. Results of Analyses of Saturated Pellet Gun-cotton fired in a 

 Close Vessel by Detonation. 



Pressure per square inch 

 Under 10 tons. 10 '5 tons. 16 tons. 16 "5 tons. 



C0 2 (vols.) 32-14 33-25 32-93 35-60 



CO .... 27-04 25-90 27'25 23-43 



H .... 26-80 26-53 25-76 24-22 



N , 13-83 14-32 14-06 15-25 



CH 4 .... 0-19 Nil Nil 1-50 



Such are the average analyses of the permanent gases generated 

 by the decomposition of gun-cotton under the various conditions I 

 have described, and it will be evident from these analyses that the 

 volumes of the permanent gases may be expected to differ to some 

 very appreciable extent, depending both upon the density under 

 which it is exploded, and also upon the mode of explosion. I have 

 found it most convenient to explode the charges, the permanent gases 

 from which were to be measured, under a pressure of about 10 tons 

 per square inch (1,524 atmospheres), and, under these circumstances, 

 the average of several very accordant determinations gave, at C. 

 and 760 mm. of mercury, 689 c.c. per gram of strand gun-cotton and 

 725 c.c. per gram of pellet gun-cotton. 



* The pressures given are those due to the gravimetric density of the charge. 



