C0MJ3USTJ0N OF CHARCOAL. 304 



No visible vapour or smoke was formed during the pro- No smoke 

 cess. The muriate of lime suspended in the receiver ac- 

 quired an addition of 5 cent. [0*772 of a gr.]; but I have 

 already observed, that ibis would result from the water con- No water 

 tained in the oxigen gas, and in the atmospheric air to which form « d ' 

 it was a few moments exposed. 



The gas in the receiver after the combustion consisted of Stateofthe 



gas. 



Carbonic add gas. • • ► 1008*9 cent. cub. zz 614*37 



Oxigen gas 508*5 = 309*65 



Nitrogen, and oxicar- 



b u retted hid rogen* 279*8 =170*38 



1797 '9 s= 1094*4 



On calculating the composition of the carbonic acid gas ion paits can- 

 from the weight of coal burned, it comes out 27*109 of car- bonic acid con- 

 bon and 72*891 of oxigen ; and from the oxigen consumed, 27-12 of base. 

 72*88 oxigen and 27*12 carbon. 



Combustion of Box Charcoal, 



I exposed some charcoal, made from box, fastened on a b ox charcoal 

 plate of platina by wires of the same metal, to a long-con- burned, 

 tinned red heat in a close vessel. This charcoal was weigh- 

 ed in a close vessel immediately after cooling, and was not 

 afterward exposed to the air longer than was necessary for 

 putting it into the receiver, where it was to be burned. 

 When this combustible in a state of incandescence was im- 

 mersed in mercury, cooled there, and passed through it Absorbs 7 

 into a jar full of common air, this air underwent in a few times its bulk 

 instants a diminution equal to seven times the bulk of the° air F esenll Yv 

 charcoal. In the present experiment this charcoal weighed 

 0*591 of a gr. [9*125 grs.], displaced 0*95 of a cent. cub. 

 [0*579 of a cub. in.], and consequently contained 665 cent, 

 cub. [4*05 cub. in.] of atmospheric air, After combustion 

 in oxigen gas it left a residuum of 2 cent. [0*31 of a gr.] 



* The quantity of oxicarburetted hidrogen must hare been hut very 

 small, since the bulk of the nitrogen present before the combwstioii 

 •*at 275 cent. cub. [167 46 cub. in.] 



Vol. XXVI Aug. 1810. X The 



