the oxygenated muriatic Acid. 301 
fame time; and as all would turn the fame way and with ~ 
the fame.f{peed, the fkains could not poflibly entangle each 
other. 
In order to fhew the ufefulnefs of this apparatus ftili more 
clearly, I requeft the Society to attend to the following ftate- 
ment of the expence of a given quantity of bleaching liquor, 
with and without alkali, but of equal ftrength. 
WITH ALKALI*®, 
fe Se 
Bo lb. of-falt, at 13d. per lb. - - - 10 0 
6olb. of oil of vitriol, at 6!d. per Ib. - - 112 6 
30 lb. of manganefe - - - 2 6 
20 lb. of pearl-afhes, at6d. perpound - - 10 © 
£2315 9 
_ But it appears by the foregoing experiments, 
that the liquor lofes ftrength by an addition of 
- alkali. The value of this lofs, which on an ave- 
rage amounts to 15 per cent. muft be added to 
the expence - - - - - 8 3 
WITHOUT ALKALI. 
‘Bo lb. of falt -! - “ - Io © 
60 |b. of oil of vitriol i Leming tie 
30 lb. of manganefe - - - 2 6 
PA en 
It appears from this calculation, that a certain quantity 
of the liquor, for the ufe of my apparatus, cofts only al. 5s. 
but that the fame quantity of the alkaline liquor cofts 31. 3s. 3d. 
which is 40 per cent. more than the other. The aggregate 
. of fo confiderable a faving muft form a large fum in the ex- 
tenfive manufactures of this country. . 
# I make no mention of the expence attending the preparation of the li- 
qvor, it being the fame in both cafes. 
XIII. A 
