On the Explosive Force of Oxygen and Hydrogen Oases. 161 



The gases were kept ready for use in a bladder mixed in the propor- 

 tions of two parts of hydrogen to one of oxygen. 



Having described the arrangements for insuring accurate experiments, 

 I now give the results in the following table, of which the first column 

 gives the quantity of gas in cubic inches which was placed in the cylinder 

 at each experiment. 



Tlie second gives the weight that was placed on the piston in pounds 

 per square inch of its surface. 



The third gives the height in inches and tenths of inches to which the 

 explosion drove the piston. 



The fourth gives the height of the barometer at the moment each ex- 

 periment was made. 



The fifth gives the height of the thermometer at the same time. 



In the last experiment, viz., that in which twenty-four cubic inches of 

 gas were exploded under a load of seventy-five pounds per square inch, 

 the explosion was unable to lift the piston ; it merely shook the weights. 



The above table gives the maximum results of upwards of two hundred 

 trials or experiments, which I have made on the explosive force of the 

 mixed gases. 



In order to shew that there is an unaccountable irregularity in the re- 

 sults of my experiments on the gases, I shall now give a few experi- 

 ments which were made with the same gases, and under the same cir- 

 cumstances. 



VOL. XXXV. NO, LXIX. JULY 1843. 



