316 



PEOF. W. A. BONE AND OTHERS ON 



The results of two typical experiments with each of the three mixtures are recorded 

 in Table XVII., whilst figs. 16, 17 and 18, reproduce the corresponding pressure 

 curves, from the moment of ignition until far into the cooling period after the 

 attainment of maximum pressure, in each case, for one experiment with each mixture. 



TABLE XVII. Pressure Experiments. 



It is evident, from the above records, that the hydrogen-air mixture is by far the 

 " fastest burning " of the three mixtures investigated, the maximum pressure being 

 reached in approximately one-tenth of the time taken in the case of the slowest 

 burning carbon-monoxide mixtures (O'Ol as compared with 010 seconds). 



The time required for the attainment of maximum pressure in the case of the 

 methane air mixtures (0'05 to 0'08 seconds) was at least five times as long as that 

 required in the case of the hydrogen-air mixtures, notwithstanding the fact that the 

 affinity of methane is something like twenty times as great as that of hydrogen for 

 oxygen in flames. Apparently, therefore, there is no direct relation between the 

 actual rate at which the potential energy of an explosive mixture is transferred on 



