the oxygenated muriatic Acid. 314 
the cloth is to be wound back upon the axis L. 
This operation is, of course, to be repeated as of- 
ten as necessary. It is plain, that by this process 
of winding the cloth from one axis upon’the other, 
every part of it is exposed, in the most complete 
manner, to the action of the liquor in which it is 
immersed. It will be necessary to turn, at first, 
very briskly, not only because the liquor is then 
the strongest, but also because it requires a number 
of revolutions, when the axis is bare, to move a 
certain length of cloth in a given time, though this 
may be performed by a single revolution when the 
axis is filled. Experience must teach how long the 
goods are to be worked ;'nor can any rule be given 
respecting the quantity and strength of the liquor, in 
- order to bleach a certain number of pieces. An in- 
telligent workman will soon attain a sufficient know- 
ledge of these points. It is hardly necessary to ob- 
serve, that, if the liquor should retain any strength 
after a set of pieces are bleached with it, it may 
again be employed for another set. 
With a few alterations, this apparatus might be 
made applicable to the bleaching of yarn. If, for 
instance, the pulley O were removed from the end 
of the axis K, and fixed immediately under the 
tube H ;—if it were perforated in all directions, and 
tapes or strings passed through the holes, skains of 
yarn might be tied to these tapes underneath the 
pulley, so as to hang down towards the bottom of 
