312 On the Process of Bleaching with 
the box. The apparatus being afterwards filled 
with bleaching liquor and the axis turned, the mo- 
tion would cause every thread to be acted upon by 
the liquor. Several axes might thus be turned in the 
same box, and being connected with each other by 
pullies, they might all be worked by one person at 
the same time ;’ and as all would turn the same way 
and with the same speed, the skains could not pos- 
sibly entangle each other. 
In order to shew the usefulness of this apparatus 
still more clearly, I request the Society to attend to 
the following statement of the expence of a given 
quantity of bleaching liquor, with and without al- 
- kali, but of equal strength. 
WITH ALKALI* 
a ie 
80 Ib. of salt, at 12d. per lb. -.. + 10 0 
6o Ib. of oil of vitriol, at 62 per lb. .--- 1 12 6 
30 lb. of manganese «.-. ---. see. eee oe 26 
20 Ib. of pearlashes, at 6 d. per Ib...-- .--- 10 0 
£2150 
But it appears by the foregoing experi- 
ments, that the liquor loses strength by an 
addition of alkali. The value of this loss, 
which on an average amounts to 15 per 
cent. must be added to the expence .... ---- 8 93 
| £3 318 
* I make no mention of the expence attending the pre. 
Paration of the liquor, it being the same in both cases, 
