The inside container for the cooking kettle or the lining for the nest
in which it is to be placed should be cylindrical in shape, should be
deep enough to hold the cooking kettle and stone, if one is used, and
should fit as snugly as possible to the cooking kettle, but at the same
time should allow the latter to be moved in and out freely. For this
purpose a galvanized iron or other metal bucket may be used, or, better
still, a tinsmith may make a lining of galvanized iron or zinc which can
be provided with a rim to cover the packing material, as shown in Figure
41. In case no hot stone or plate is to be used, the lining may be made
of strong cardboard.
[Illustration: _Fig._ 41.--Metal lining with rim]