COMBUSTION OF CHARCOAL. SOS 



Combustion of Anthracite. 



I burned in oxigen gas 0'549 of a gr. [8*476 grs.] of Stone coal 

 anthracite dried at a red heat*. The combustible that dis- ne ' 

 appeared in this operation weighed 0*524 of a gr. [8*09 grs.], 

 deducting the ashes, which weighed 0*0-25 of a gr. [0*368 

 of a gr.] 



The receiver, in which the combustion was effected, con- 

 tained previous to it 1886*4 cent. cub. [1148*7 eub. in.] of 

 impure oxigen gas, at 0*73089 met. [28*755 in.] of the barora., 

 and 21 *56° of the therm. [70*8° F.] 



After the combustion the gas occupied the space of 1894*3 

 cent. cub. [1 1535 cub. in.], at the same pressure, but at the 

 temperature of 24° [75*2°]. 



Reducing these quantities of gas to the mean tempera- 

 ture of 12*5° [54*5° F.], and pressure 0*75796 met. [29*82 

 inches], we find, that the volume of gas was 



Before the combustion* • 1755 cent. cub. zz 1068*7 cub. in. Diminution of 

 After the combustion •• 1748*2 =1064*56 the gas. 



Diminution 6*8 S&. 4*14 



The anthracite formed a little smoke in burning. The Smoke, 

 muriate of lime increased in weight 8 cent. [1*235 gr.]; 

 but as the hygrometrical water of the oxigen gas weighed 

 0*0336 of a gr. [0*519 of a gr.] at the temperature of 22° 

 [71*6° F.], at which the process was conducted; and as the 

 salt absorbed I cent. [0*154 of a gr.] of water from the air, 

 during the time of arranging the apparatus; I found, that WaterformetL 

 the quantity of water produced by the combustion of the 

 coal was about 0*0364 of a gr. [0*562 of a gr.] 



In 100 parts of the gas employed for the combustion the State of the ga« 



hidrosulphuret of potash indicated 94 of oxiiren and 6 of before th . e 



Tr u I j- ,» i „ combustion, 



nitrogen; Volta s eudiometer, 94*25 of oxigen, and 5*75 of 



* This anthracite is found in nodules in a transition pudding-stone, 

 near Martigny, in Vallais. It loses by incandescence O'lQ of its 

 weight, and then attract? a little moisture from the air. For this 1 



reason I did not leave it exposed to the air after drying. On cooling 

 it absorbed its own bulk of atmospheric air. This absorption may be 

 neglected. 



nitrogen. 



