Researches on Mot/cm Explosives. 



229 



Another point which we had to consider was the different deflection 

 caused by the firing of different quantities of the same explosive in the 

 same bomb. 



DiaCtEAM 1. 



200 



.§ /CO 



I 





1 







c 























































3 Inches above chdr§e. 



Diagram 2 shows the result of firing 4, 5, 6, and 7 grammes of the 

 same explosive in the same volume with couples 2 and 5, 



DiAGEAM 2. 



COMPOSITION ( 

 OF 

 CHARGE. 



< 70% OuncoUon, zo% Nitto-^Lycerine. 

 ^ di - GrdLmmes . 



100,000 



of din inch. 



The points of deflection have been connected by a straight line 

 simply for the purpose of showing the general parallelism of these 

 observations. 



With charges of less than 4 grammes the results were very irregular, 

 and we have not fired charges larger than 7 grammes, the bomb not 

 being constructed to withstand high pressures. 



Having thus ascertained the conditions of working which gave fairly 

 concordant results, a series of experiments was made with couples of 

 different diameters, and, by means of introducing some suitable resist- 

 ance into the circuit of the galvanometer, it was arranged that the 



