31 



LIME COMPOUNDS. 



In the tables of analyses the data on the left-hand page gives 

 the actual composition of the different lime products. On the right- 

 hand, or opposite page, will be found the probable combinations of 

 the ingredients as calculated by the analytical data. It is felt that 

 this arrangement \\'ill give the purchaser a definite idea as to the 

 actual character of the lime products sold. Changes are continually 

 taking place in the composition of caustic and hydrated limes. 

 Caustic lime upon long standing and exposure will take on both 

 water and carbon dioxide and become air-slaked. Hydrated or 

 slaked lime upon long standing and exposure will absorb carbon di- 

 oxide; in other words, it will have a tendency to revert to its original 

 chemical form as found in the lime rock (calcium carbonate). 



The different forms of lime have been grouped in the tables as 

 follows : 



Whenever data in regard to the cost of the lime product has been 

 available, the actual cost of 100 pounds of calcium and magnesium 

 oxides has been calculated. A ton of lime when bought in paper or 

 cloth bags usually costs from $1 to $1.50 more than if purchased in 

 bulk; if the buyer furnishes bags the cost per ton is not likely to 

 exceed 50 cents more. 



A summary table which follows gives the highest, lowest and 

 average cost of 100 pounds of calcium oxide from the various forms 

 of lime. 



It is apparent from the above summary that it is well worth 

 while to procure quotations from various lime companies. It is felt 

 that more attention should be given to mechanical condition of lime 

 than has been done in the past. In all probability the finer the ma- 

 terial the more active the lime will be. In the tables will be found 

 the mechanical analysis of each sample inspected. While the 



