498 Prof. It. Bun sen on the Temperature of the 



with a variation in the single experiments of 4*41 per cent, of 

 the whole increase of temperature. 



(4) That a mixture of hydrogen with atmospheric air in the 

 proper proportions (experiment 14) is heated by combustion in 

 a closed vessel from 0° C. to 



2024° C. 



Columns IV. and V. show the very remarkable fact — 



(5) That whether the mixture be pure carbonic oxide and 

 oxygen, or hydrogen and oxygen, during the maximum tempe- 

 rature t l — t (mean of experiments 1, 2, 3, 12, and 13) almost 

 exactly one-third of the hydrogen or carbonic oxide present is 

 burned, since 



_ 1 

 *~ 3-015' 



whilst the remaining two-thirds have lost the power of combining 

 even when heated from 2558° C. to 3033° C. 



(6) That when 1 volume of the same explosive mixtures is 

 diluted with from 0*686 to 3*163 volumes of an incombustible 

 gas, and in consequence the temperature of the flame sinks from 

 2471° C. to 1146° C. } at all temperatures within these intervals 

 almost exactly the half of the carbonic oxide or hydrogen is 

 burned. The mean of all experiments gave 



_ 1 

 *~ 1*992 



In the remaining halves oxygen and carbonic oxide, or oxygen 

 and hydrogen, had lost the power of combining with each other. 

 The products of combustion of a mixture of pure carbonic 

 oxide and oxygen at 3033° C. consist of 



Oxygen . . . 1 vol. 

 Carbonic oxide . 2 vols. 

 Carbonic acid . 1 vol. 



In like manner, the detonating mixture of hydrogen and oxygen 

 at 2844° C. gave 



Oxygen . . . 1 vol. 



Hydrogen . . 2 vols. 



Water- vapour . 1 vol. 



Between the temperatures 2471° C. and 1146° C. a mixture 

 of carbonic oxide and oxygen forms the following products of 

 combustion :— 



Oxygen . . . 1 vol. 



Carbonic oxide . 2 vols. 



Carbonic acid . 2 vols. 



