M. TECHNOLOGY. 505 



IMPEOVEHENT IN THE HANUFACTUEE OF SUGAE. 



The Abbe Moigno, in Les Mo?ides, makes a mysterious an- 

 nouncement in regard to the sugar industry, in which he asks 

 what his readers would think if he were to say that he ex- 

 pected soon to be able to reveal the details of a process by 

 which the juice of the beet-root, treated immediately after its 

 extraction, first by lime, and then by a mysterious, sovereign 

 agent, should furnish spontaneously, in the condition of very 

 pure crystals, all the sugar which it contained ; or what would 

 be thought of the statement that a Frenchman had lately en- 

 tered into his sugar beet-root establishment with freshly col- 

 lected beets, and come out in a few minutes after having the 

 pulp in one hand, and in the other the crystallized sugar? 

 He promises before long a satisfactory answer to these co- 

 nundrums ! 3 B^ January 11, 1872, 46. 



USE OF CAUSTIC BAEYTES IN SUGAE-EEFINING. 



Dr. George Lunge publishes in Dingler's Polytechnic Jour- 

 nal an account of his method of using caustic barytes for the 

 separation of the sugar from molasses in the sugar refinery ; 

 this, in his view, being one of the best methods known, since 

 it forms an insoluble combination with the sugar, which can 

 be again decomposed, by means of carbonic acid, into insolu- 

 ble carbonate of barytes and soluble sugar. The details of 

 the process are too technical for our columns, but this refer- 

 ence to the article ma}' be of service to some of our readers. 



14 6 T ,ccii.,m. 



COATING METALS WITH COAL VAENISH. 



The following method is described by which metallic ob- 

 jects may be coated with a durable black-brown varnish : 

 On the bottom of a cylindrical cast-iron vessel, eighteen inch- 

 es high, is placed a layer of coal-dust, half an inch thick, upon 

 which is placed an iron grating, and thereon are placed the 

 objects intended to be coated with varnish. The vessel, hav- 

 ing been first closed with a well-fitting lid, is next placed on 

 a bright coke fire, and heated for about a quarter of an hour, 

 just to incipient red heat. The vessel is then removed from 

 the fire, and, on the lid being taken off after about ten min- 

 utes, the metallic objects will be found coated very uniformly 



Y 



