564 ANNUAL KECORD OF SCIENCE AND INDUSTRY. 



A NEW APPLICATION OF CENTRIFUGAL ACTION IN THE MAN- 

 UFACTURE OF SUGAR. 



It is claimed that Weinreich & Schroder have succeeded 

 in the application of centrifugal action in the production of 

 common sugar and purified loaf-sugar without the usual 

 method of liquoring. In case of the loaf-sugar, a current of 

 air, drawn in by the centrifugal action, and with which steam 

 is mixed, is employed to aid in the removal of the last traces 

 of sirup. The amount of sugar obtained is said to be larger, 

 and ten hours to be sufficient, after concentration, to produce 

 a marketable article. Time, labor, and storage-room are 

 thereby greatly economized. 8 (7, Septernher 19, 1872, 303. 



COATING PAPER WITH GRAPHITE, ETC. 



The following process for coating paper with graphite has 

 been patented by W. N. Lake, of London. Unsized paper, as 

 in parchmentizing, is best treated with a mixture of two vol- 

 umes of fuming sulphuric acid and one volume of water. As 

 soon as the surface seems gelatinized, it is quickly removed, 

 and sprinkled with graphite or other mineral substance, as 

 emery, etc., on one or both sides ; and then immediately im- 

 mersed in water containing a little soda, and finally carefully 

 dried. This process is also adapted to fabrics of vegetable 

 fibre. 15 C, 1873, 14. 



REMOVING ODOR OF SULPHIDE OF CARBON. 



Sulphide of carbon is an important substance for many in- 

 dustrial purposes, but its disagreeable odor is very much in 

 the way of its extensive employment. Quite lately a method 

 has been devised for removing the odor, which is said to ac- 

 complish its object. To efiect this, it is first to be shaken up 

 with one per cent, of corrosive sublimate, this operation be- 

 ing repeated several times, after longer or shorter intervals. 

 In this way certain sulj^hurets are produced, which cause the 

 salt of the mercury to turn black. The liquid is then to be 

 distilled, and that which passes over will have a much less 

 disaofreeable smell. If one third of its bulk of the oil of al- 

 monds be added, the result is very satisfactory. The sul- 

 phide, under these circumstances, emits a pleasant odor, 

 somewhat like that of ether. 9 J5, August^ 1872, 621. 



