95 



diffusion juice, the quantities of coal consumed would be 8.58, 5.89, and 

 4.44 pounds, respectively. To reduce this to masse cuite would require 

 the same consumption as before, viz, 4.44 pounds. One hundred pounds 

 of cane chips will yield by diffusion an average of 10 pounds of sugar 

 for the whole State of Louisiana. The coal consumed in evaporation, 

 therefore, would be : 



Pounds. 



For a double effect 13. U2 



For a triple effect 10.33 



Fora quadrup.e effect 8.88 



The above computation includes the exhaust steam from the pumps, 

 centrifugal engine., etc. The quantity of steam required to run the bat- 

 tery must be added to the above. It certainly would not amount to 

 more than two pounds per hundred of cane used. 



With the best apparatus most economically arranged the total con- 

 sumption of coal per 100 pounds of cane would be : 



Pounds. 



For a double effect 15. 02 



For a triple effect , 12. 33 



For a quadruple effect 10. 88 



Reduced to 1,000 pounds of sugar from cane yielding an average of 

 10 per cent, of all sugars, the figures become: 



For 1,000 pounds sugar Pounds. 



With double effect 1, 502 



With triple effect 1,233 



With quadruple effect 1,08 



In ail these calculations the coal is assumed to be of fair average 

 quality, and to be a'>le to convert 6 pounds of water into steam at usual 

 boiler pressure for each 1 pound of coal. In general, then, it may be 

 said the quantity of coal required to make 1,000 pounds of sugar by 

 diffusion varies from 1,000 to 1,500 pounds, according to the system of 

 evaporation employed. 



Diffusion can only be made an economical success when the best ma- 

 chinery and the most economical methods are employed. The great 

 objection which has been urged against it, viz, the increased consump- 

 tion of fuel required, is entirely removed when the process is carried 

 on under the economical conditions which have been mentioned. 



To attempt to introduce diffusion with old and worn-out apparatus, 

 defective boilers and open pans, would simply be disastrous. It can 

 only succeed when the highest mechanical skill, associated with the 

 best scientific control, directs all the operations of the sugar house. 



In the one experiment where actual weighings have been completed 

 of the whole product, viz, the fourth run, the quantity of sugar made 

 per ton is : 



Pounds. 



First : 165.5 



Seconds 45. 9 



Thirds 18.6 



Total.. . mo 



