[Manin sys, 
VII. Account of a new Method of Bleaching Cotton. By 
C. CuapraL, Member of the National Injiitute*. 
Tue happy applications which C. Berthollet has made 
of the oxygenated muriatic acid, in the bleaching of ftuffs 
manufactured from vegetable fubftances, feems to have car- 
ned this art very near to perfection; but this method is not 
every where attended with the fame degree of economy. Be- 
fides, the procefs requires very fkilful hands, that the ftuffs 
may not be deftroyed by too corrofive leys, or leys impro- 
perly employed; and therefore we ought not to omit making 
known other proceffes, in order that manufacturers may 
choofe thofe which they may think moft beneficial. I fhall 
therefore here defcribe a procefs, both fimple and economical, 
. for bleaching cotton yarn. 
At the difiance of about one foot four inches from the 
grate of a common furnace, place a copper kettle of a round 
form, one foot and a half in depth and four feet in diameter, 
and fix it in that pofition. The brim of this kettle, about 
fix inches in breadth, being bent outwards, will reft on the 
lateral edges of the mafon- work of the furnace. The re- 
mainder of the furnace muft be conftructed of cut ftone, in 
the form of an oval boiler, fix feet in height, and in breadth, - 
-meafured from the centre, five fect. The upper part of the 
furnace has a round aperture, in diameter about a foot and a 
half. This aperture may be clofed by means of a moveable 
ftone, or a copper lid made for the purpofe. On the edge of 
the copper kettle, which forms the bottom of this fpecies of 
digefter, place a kind of grate confifting of wooden bars, 
brought pretty near to each other in order that the cotton 
Jaid upon them may not fall through, and fufficiently ftrong 
to fufiain the weight of about 1600 pounds. When this 
apparatus has been conftructed, impregnate the cotton dif- 
pofed in bundles, with a flight folution of foda, rendered 
cauftic by lime: this operation muft be performed in a 
wooden or ftone trough, in which the cotton may be trod 
; * From the Bulletin des Sciences, Vol, 11, No 6. 
upon 
