THE 



LONDON, EDINBURGH, and DUBLIN 



PHILOSOPHICAL MAGAZINE 



AND 



JOURNAL OF SCIENCE. 



SUPPLEMENT to VOL. XXXIV. FOURTH SERIES. 



LXV. On the Temperature of the Flames of Carbonic Oxide and 

 Hydrogen. By R. Bunsen*. 



[With a Plate.] 



Vl/HEN a mixture of a combustible gas with oxygen is in- 

 ▼ » flamed, an elevation of temperature occurs, which can 

 be calculated from the heat of combustion of the gas and from 

 the specific heats of the products of combustion, for every case in 

 which the combustion of the mixture at the prevailing tempera- 

 ture is complete. 



Given a mixture of h parts by weight of hydrogen, parts by 

 weight of oxygen, and n parts by weight of nitrogen ; then (pro- 

 vided the combustion be complete, and oxygen be present in ex- 

 cess) hw units of heats will be produced, and the following- pro- 

 ducts of combustion formed, 



H + O. 



/ 



where H and represent the atomic weights of hydrogen and 

 oxygen, and w the heat of combustion of hydrogen. If we call 

 the specific heat of these products of combustion by the series 

 °"to a oi Vm then we have 



t]= /h+o\ 7 , / ory~~ • • • (1) 



y-^—)hcr+yo--^h)<T + n(T n 



This equation is simplified, as remarked, on the supposition that 

 the mixture of gases h can be completely burned at the high 



* From Poggendorff's Annalen, vol. exxxi. p. 161 ; communicated by 

 Professor Roscoe. 



Phil. Mag. S. 4 No. 233. Suppl. Vol. 34. 2 K 



