26 CYANAMID — MANUFACTURE:, CHE:MISTRY AND USES 



Bag B.~Anai.ysis. 



Carbon 



Moisture dioxide Nitrogen Calcium 



Per Per Per Per Ratio-^ 



Sample drawn cent. cent. cent, cent. Ca 



Nov. 17, 191 1 0.00 1.75 16.34 40.53 0.4031 



Dec. 17, 191 1 0.43 2.10 16.09 39-94 0.4029 



Jan. 17, 1912 0.44 2.70 15.87 39.35 0.4033 



Feb. 17, 1912 0.46 2.83 15.70 38.94 0.4031 



May 17, 1912 0.69 3.96 15.50 38.76 0.3999 



Weights. 



Per cent, 

 gain in 



weight Per cent. Per cent. 



Weight Gain in since nitrogen Per cent, nitrogen 



pounds weight previous calcu- nitrogen gained 



net pounds weighing lated found or lost 



Nov. 17, 1911 149.00 _ _ _ 16.34 — 



Dec. 17, 1911 ^151.75 2.75 1.84 16.046 16.09 -fo.04 



" " " '150.75 



Jan. 17, 1912 152.25 1.50 0.99 15.890 15.87 —0.02 



" " " 151.25 



Feb. 17, 1912 151-75 0.50 0.33 15.838 15.70 —0.14 



" " " 151.25 



May 17, 191 2 154.75 3-50 2.31 15-480 15.50 +0.02 



The addition of free moisture, chemically combined moisture, 

 and carbon dioxide necessarily increases the weight of the 

 sample, and hence causes a proportionate decrease in the 

 percentages of other constituents. It is evident that calcium 

 cannot escape from the stored material either by volatilization, 

 since calcium compounds require at least a red heat before 

 they vaporize appreciably, or by leaching, since the mass re- 

 mains practically dry for years. The decrease in calcium per- 

 centage must therefore be due solely to the addition of other 

 matter, and the ratio of the calcium percentages before and 

 after exposure is equal to the inverse ratio of the weights be- 

 fore and after exposure. Thus in bag A the ratios are 



40.-^4 106.32 ., , 1 . r ^ 



- — ^^ = or there has been an increase 01 6.32 per cent. 



37.94 100.00 



on the original weight. As shown by the weighings, the in- 



^ Before sampling. 

 2 After sampling. 



