318 On the Quantity of Carbon in Carlonic Addy 



A portion of this coal was placed under sand in a crucible, 

 and exposed to a strong heat for one hourj 4 grains of it 

 thus jircpared were put into the tray: our oxygen left a 

 residuum of 3 parts in 100, and we began with 49*84 cubic 

 inches as usual. The tray being placed in the platina tube 

 was heated to redness for about 10 minutes. When the 

 gas was first passed, we thought we saw a flash in the glass 

 tubes. On suffering the whole to cool the quantity of gas 

 still remained the same, and the tray being drawn out con- 

 tained only -5 of a grain unconsumed. From the gas thus 

 charged with 3*3 grains of coal, 



Lime water absorbed 53 parts from 100. 



'i'he tests for oxygen 39 



Residuum - 8 or an increase of 3. 



100 



Correction for temperature. 

 60" 0-103 49-84 



57 3 -30 



3 diff. 0'309 add for temp. 50- 1 i 



Correction for pressure. 

 30 : 29-65 :: 50-14 : J 9' 55. 

 The qviantity of oxygen at the mean was therefore 49-55 

 cubic inches. 



100: 53 : : 49'55 : '20-26. 

 Consequently 26-26 cubic inches of carbonic acid gas 

 were produced. 



100:47-26:: 26-S6: 12-41 grains. 

 12-41 : 3-50 : : 100 : 28-20. 

 Then, according to this experiment, 100 grains of carbo- 

 nic acid gas contain 28-20 of coal. 



Calculation by oxygen. 

 100 : 33 82 : : 2G-20 : 8.SS grains of oxygen consumed. 

 3-50 coal 



12-38 



Calculation 



