M. TECHNOLOGY. 541 



A PASTE SUPERIOR TO GUM ARABIC. 



A brilliant and adhesive paste, adapted to the uses of 

 manufacturers of fancy articles, painters, etc., may be made 

 by dissolving caseine precipitated from milk by acetic acid, 

 and washed with pure water, in a saturated solution of bo- 

 rax. 5 (7, xx., 160. 



SEPARATION OF HONEY FROM THE COMB BY CENTRIFUGAL 



ACTION. 



Superiority over all other machines of the kind is claimed 

 for the centrifugal machine of Baron Rothschiitz, for the sep- 

 aration of honey from the comb, in its applicability in all 

 cases without reference to the size of the comb. It is also 

 cheap, works easily and without noise, and can be readily 

 taken apart and cleaned. The honey can be removed from 

 the comb in from thirty to forty seconds, one man being- 

 able to work two hundred-weight in an hour. 13 (7, May 1, 

 1874, GOG. 



REMOVAL OF BURS, ETC., FROM WOOL BY CHEMICAL AGENTS. 



The so-called chemical method of cleansing wool, either 

 raw or manufactured, from foreign vegetable matter, such as 

 burs, straw, etc., is founded upon the well-known fact that 

 strong acids, especially sulphuric, when diluted and aided by 

 heat, destroy vegetable matter much more readily than they 

 do wool. The importance of the process is indicated in a 

 measure by the numerous patents which have followed its 

 introduction. The wool is first placed in a bath of sulphuric 

 acid of 3 to 4 Baume, and the acid removed from it by a 

 centrifugal apparatus, and finally placed for a suitable length 

 of time in a chamber heated to 212, where the vegetable 

 matter is carbonized, while the wool remains uninjured. The 

 adhering acid is removed by thorough washing. Careful in- 

 vestigations have been made by Duclaux, Lechartier, and 

 Raulin, as to the conditions most favorable to the operation, 

 and least liable to injure the wool. It was found that treat- 

 ment of the wool with certain salts, as chlorides, sulphates, 

 etc., before the operation, with a view to protect it from the 

 action of the sulphuric acid, is not only worthless, but may 

 even be injurious, in some cases, in the subsequent operations 



