S04 



COMBUSTION OF CHARCOAL. 



nitrogen. Hence the 1755 cent. cub. of gas employed in 

 the combustion contained 100*9 of nitrogen. 

 State after it. The 1748*2 cent. cub. of gas in the receiver after the 

 combustion were found to consist of 



Carbonic acid gas • . • •998*27 cent. cub. rz 607*9 cub. inch. 



Oxigengas 6l6'82 S 375*6 1 



N i trogen gas 1 00*9 zz 6 1 *44 



*= 19*6l 



Oxiearburetted hidrog. 32*21 



1748*20 



= 1004*56 



Its properties. 



Combustion of (he Coat formed by Oil of Rosemary, 



Charcoal from By passing oil of rosemary in a state of vapour through 

 essential oil. a re( -| fo ot p 0rce | a * n tube, I obtained a coal, which appeared 

 well adapted for determining the composition of carbonic 

 acid. 



The coal, heated red hot in the fire, and extinguished 

 without the contact of air, did not absorb different gasses, 

 in which it was immersed. It did not increase in weight 

 after this incandescence, even though exposed several 

 months to the open air. It formed no ashes. It burned 

 with the same difficulty as plumbago. It was heavy, and 

 sufficiently hard to scratch glass. 



1 burned 0*513 of a gr. [7*92 grs.] of this coal in a re- 

 ceiver containing 1947*93 cent. cub. [1186*19 cub. in.] of 

 oxigen gas at 20*87° [80*37° F.] temperature, and 0*73684 

 met. [28*99 inches] pressure. 



After the combustion the gas occupied the space of 

 1958*83 cent. cub. [1192*83 cub. in.], at 27*5° [81*5° F.] 

 temperature, and pressure as before. 



On reducing the voiume of the gas before and after the 

 experiment to the mean temperature of 12*5° [54*5° F.], 

 and pressure of 0*758 met. [29*32 in.], we tind it occu- 

 pied 



Increase of the Before combustion, 1791*5 cent. cub. ffi 1090*93 cub. in, 

 •**- After 1797*2 = 1094*4 



Burned, 



Results. 



ase« 



5*7 



as 3*47 



No 



