120
A.
TREATISE ON
TO PACK THE LOWER RECTIFIERS.
First on the false bottom (which is perforated with
half inch holes), place a woollen blanket or cloth,
on that put six inches of coal, then
t
peck barley
malt ; fill up to within two feet of the top with coal
-put on another blanket or cloth; on that place
another
t
peck of malt, and
fill
up to within 8 inches
of the top with coal
TO PACK THE UPPER RECTIFIERS.
These may be filled entirely with coal, to within
eight or ten inches of the top, unless you choose to
put sand into the bottom, which is not material.
TO KEEP THE RECTIFIERS GOOD.
Remove from the top of the. upper rectifiers, once
in three months ; and from the tops of the lower
ones, once in six months, six inches of the coal ; and
replace the same with fresh coal, which will renew
the rectfiers, and keep them good for a long time.
Be particular at all times to keep
aU
of
the tubs
closely covered, so as to prevent evaporati,on.-Ne-
01gi1ized
by