M. TECHNOLOGY. 577 



longer, also render the cards more effective. The material 

 is also worked better, because the spaces between the wires, 

 on account of their diminished thickness, are greater, and 

 impurities collect in them, and can readily be removed. 

 9 C, March, 1873, 40. 



IMPROVED METHOD OF DRYING CLOTH FABRICS. 



An imjDroved method of drying cloth textures, devised by 

 Bastaert, and one that probably may be applied advanta- 

 geously on a large scale in the laundry, consists in passing 

 them over several rows of apertures in iron pipes, out of 

 which superheated steam issues. This penetrates the cloth, 

 and dries it, in virtue of the tendency of the steam to absorb 

 water, and to its high temperature. The steam is drawn into 

 a flue above, in which there is a strong current of air. One 

 advantage of the process is that the original surface of the 

 web is not exposed, thus avoiding the injury it is apt to sus- 

 tain from contact with heated drums or plates in the ordinary 

 process. 18 A, May 30, 1873, 272. 



ANTHRAPURPURINE, A NEW ALIZARINE DTE. 



Mr. William H. Perkin, to whom we owe so much for his 

 researches among the aniline colors, has lately communicated 

 a paper to the Chemical Society of London upon Anthrapur- 

 purine, in which he renjarks that his attention has for some 

 time been directed to artificial alizarine, with a view of elimi- 

 nating certain associated colors and utilizing them in the 

 arts. He has now succeeded in separating one of these, and 

 making and introducing it to notice, under the name of An- 

 thrapurpurine. His method consists in dissolving the crude 

 coloring matter in dilute carbonate of soda, and then agita- 

 ting the resulting solution with freshly precipitated alumina, 

 which combines with the alizarine, leaving the anthrapurpu- 

 rine in solution. This is filtered from the alizarine liquid, 

 heated to boiling, and acidified with hydrochloric acid. The 

 coloring matter which is present is collected on a filter, 

 washed and dried. The Anthrapurpurine thus obtained is 

 very impure, being associated with a substance which dyes 

 alumina mordant of an orange color (and which is now under 

 investigation), as well as with anthrafluvric acid, etc. Per- 

 kin gives a method for obtaining a pure anthrapurpurine, 



Bb 



