Still is constructed throughout of resistance glass and has
been designed to give a high grade water distillate at a low
Water entering the still first passes through the coiled condenser
tube where it is preheated to about 70°C. Slight deposits
are taken up in the pumice container before water enters the
boiling flask, thus facilitating the cleaning of the apparatus.
The specially designed baffle in the stillhead prevents any
carry over of water splashes with the steam, and the wide
bore of the up sloping tube connecting the stillhead with
condenser eliminates any back-pressure. The steam condenses
mainly in the coiled condenser tube but a small amount emerges
from the side tube, carrying with it the greater proportion
of carbon dioxide and other gases evolved during billing.
As the still is constructed throughout of resistance glass,
practically no ionisable material contaminates the distillate,
for maximum life and to minimise possible breakage a wire
gauze should be interposed between burner and flask.
Note: Two stills may be used for double distillation, in which
case the distillate from the first unit is fed directly into
the constant level pot of the second unit, each unit should
be equipped with its own seperate water supply. It is also
possible for distillation to be carried out on already - distilled
water employing a 2 or 3 litre flask with standard ground
joint but without constant level device.