﻿58 



cox. 



Still another sample of Ncgros coal jSTo. 21 was dried at 107° for one 

 hour and the total volatile matter determined to be 50.22 per cent. 



These results show that owing to the very gradual expulsion of the 

 moisture by the smoking-off process, the presence of water in these coals 

 has no influence on the percentage of volatile combustible matter. The 

 only effect noticed was that the presence of the water very much reduced 

 the tendency of the fine particles to fly off in sparks. The loss by the 

 official method was eliminated in some cases when a small amount of 

 water was mixed with the coal. 



The analyses by the official method of Negros coal No. 21, given on 

 page 46, show an average of the total volatile matter of 57.68 per cent, 

 and at the same time a great discordance clue to mechanical loss, as is 

 indicated by the low percentage of ash. When water in the amounts 

 given in the following table is added and thoroughly mixed with a plati- 

 num wire or spatula the results are as shown below. It was thought that 

 there might be a difference in the results if a spatula were used instead 

 of a wire, owing to the fact that with the former the water could be 

 more perfectly introduced into the interstices of the coal. 



Table 7. 

 TT hen the miring ivas clone with a wire. 



Grams 

 water 

 added 

 per gram 

 of coal. 



Total volatile 



matter, per 



cent. 



Ash, per 

 cent. 



Average. 



Total 

 volatile 

 matter, 

 per cent. 



Ash, per 

 cent. 



0.00 



0.05 

 0.1 



0.2 

 0.3 



56.92 



57.42 

 58.69 



52.25 

 52.34 



52. 59 

 52.50 

 52. 85 



53.71 

 53.90 



52.85 



16.51 

 16.68 

 15.77 



17.63 

 17.68 



17.76 

 17.65 

 18.06 



17.98 

 17.80 



57.68 



52.30 



52. 64 



53. 85 

 52.85 



16.32 



17.66 



17.82 



17.98 

 17.80 



When the mixing was done with a spatula. 



Grams 

 water 

 added 

 per gram 

 of coal. 



Total volatile 



matter, per 



cent. 



Ash per 

 cent. 



Average. 



Sers. 1. 



Sers. 2. 



Total 

 volatile 

 matter, 

 percent. 



Ash, per 

 cent. 



0.1 



0.2 

 0.3 



50.72 

 50.54. 

 51.47 



51. 03 

 52.42 



17771" 



51.39 



51. 64 

 52. 01 



17.71 



17.78 

 17.94 



52.74 



17.78 



52.55 



17.94 











