An Ejpyt on Bleaching. Ill 



. an ounce of the like folution of Dantzic potafh will contain 

 50 grains. 



The deterfive force of lime was tried without fuccefs ; three 

 ounces of water, faturated with lime, produced fcarcely any 

 effect on the colouring matter: theie three ounces contain 

 at mod three grains of pure lime. 



Defer iptlon of Apparatus. 



Fig. 1. (Plate N.) the new. apparatus propofed by the 

 author for preparing liquid fulphurous acid, and which may 

 fervc alfo for dhtilhng oxvgenated muriatic acid. A, a lec- 

 tion of the furnace, which is a land bath, and contains three 

 dalles (as may be feen in the horizontal lection fig* 2). Each 

 flalk is furniflied with a bent tube a, for pouring in the ful- 

 phuric acid ; and from it the liberated gas pa iTes by the tube b 

 into the receiver B, which is made of lead. This receiver 

 has five necks (vide fig. %.)-. three of them receive the tubes 

 connected with the three fialks, one receives a fafctv-tube c, 

 intended to prevent abforption, and the 5th the bent tube d 9 

 which connects it with the feries of tall Wolfs C, D, 8cc. 



Fig. 3. (hows the way in which it is propofed to alter Mr. 

 Rupp's apparatus. The Huff is made to pafs over rollers in the 

 corners, &c. of the box in going from one reel to another, 

 and the axes come through leather collars in the fide infteadof 

 the top of the box. The-eno raving reprefents a vertical fe&ioti. 



Fig. 4, a boiler and {learning chamber. A, the boiler, 

 charged with ftale urine, rendered cauftic by the addition of 

 quicklime*. The ammonia thus difengaged pafies through 

 the tube B into the chamber C, which is furniflied with 

 reels and rollers for winding the fluff, and thus expofing it to 

 the action of the vapour. At the corner a, the uncondenfeil 

 vapour can pafs into the worm-tub D to be condenfed, and 

 returned to the boiler by the tube be. Or it may be received 

 into the tub E by fhutting the cock at c y and opening the 

 cock n. The opening into the chamber, i. e. the door, is 

 on the top, and (huts air-tight. With this apparatus, vapour 

 or fteam of any kind may be employed for the purpofe of 

 bleaching. 



[To be continued.] 



* For this method of applying ammonia to the purpoft-s of bleaching, 

 the world is indebted to Mr. Crooks, of Edinburgh, who, a conhderabie 

 time ago, took out a patent for it for England. The lame gentleman 

 having, along with Air. Turnbull, improved the proctls, and extended the 

 principle to the ufe of fixed alkalies alfo, alfiftcd by the action of the ttcarn 

 of boiling water, patents have fince been taken out in their joint names for 

 .England, Scotland, and Ireland. Of this invention wc gave an account 

 in our ninth volume. — Kdjt. 



XIX. Be- 



