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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-

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