T H E CU R A REVIEW 



Valuable Waste Substances. 



A recent address hy Otto Witt, a cele- 

 brated German chemist, is commented 

 upon by Nature, Paris, Jan. 8, as follows: 



"We do not generally realize, in fact, 

 what a total may be attained by the value 

 of the useful elements lost too often in the 

 residues of factories. The powerful mod- 

 ern industries have a very intensive pro- 

 duction, and the smallest figure is so 

 greatly multiplied that it changes into mil- 

 lions. Interesting facts on this subject 

 have been published recently by Mr. J. 

 Effront, director of the Institute of Fer- 

 mentation at Brussels, and Mr. A. Aulard, 

 the well-known sugar chemist. The 

 figures relative to the value of principles 

 contained in the residues of sugar-mak- 

 ing and distilling which are theoretically 

 utilizable, but in most cases practically 

 unutilized." 



First mentioned among these residues 

 is the "mash" from which spirituous 

 liquors are distilled. This contains salts 

 of potash and soda and various nitrogen^ 

 ous compounds. Sometimes the potash is 

 saved by evaporation and calcination, but 

 generally the whole mash is thrown away, 

 and in any case all the nitrogen is lost. 

 In grain-distillation about a pound of 

 nitrogen is thus thrown away for every 

 ten gallons of alcohol produced. It has 

 l)een calculated that the equivalent of 

 100,000 tons of ammonium sulphate, 

 worth about $4,000,000. is annually lost in 

 Europe alone. 



An Informing Handbook. 



The Pratt Engineering & Machine 

 Company have just issued their very 

 handsome Bulletin 141, describing cane 

 sugar milling machinery. This Bulletin 

 goes at length into a description of the 

 Pratt "Imperial" Mills, Crushers, Gear- 

 ing and accessories. There are half- 

 tone cuts, some in phantom, of every 

 part of the "Imperial" Mills and Crush- 

 ers, with descriptions clear and tangible 

 and the layman can easily understand the 

 different points of construction, and fur- 

 ther understand why the exceedingly 

 large pressures on the top rolls of the 

 Mdls are possible with such narrow turn 

 plates. 



This is the first bulletin of its kind 

 that has ever been presented to the 

 Sugar fraternity, and it is believeed that 

 it will be thoroughly appreciated for it 

 is almost a hand-book on the construc- 

 tion of sugar mills, and will help to de- 

 cide what make of mill and crusher 

 should be installed. 



This bulletin may be obtained by writ- 

 ing the Pratt Engineering & Machine 

 Company, Atlanta, Ga. 



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