218 



SIR ANDREW NOBLE: RESEARCHES ON EXPLOSIVES. 



The temperature of the water in the outer vessel did not move during the 

 experiment, being 21'0 C. before and after. 



A second determination of the heat, developed under the same conditions, was 

 made in Experiment 1345, which was simply a repetition of Experiment 1344. Here, 

 immediately before explosion, the differential thermometer gave a temperature of 

 0722 (equivalent to 19'4 C.). 



Here the maximum temperature reached in 8 minutes was 

 Subtracting temperature before explosion 



Correction for loss of heat 



C. 



2-618 

 0722 



l-896 

 0'009 



1-905 



Hence units of heat developed = 4680x1 ' 905 = 972 '2 units. 



9'17 



The previous experiment having given 9727 heat units, the mean may be taken 

 as 972'5. It is unnecessary to say that this degree of accuracy is exceptional, but 

 still, considering the nature of the experiments, the accuracy, even at moderate 

 densities, cannot be considered unsatisfactory. 



Thus in Experiment 1392, at a density of 0'25, 7737 grammes of M.D. were fired, 

 the differential thermometer being at 2'012 (equivalent to 18'3 C.). Hence 



