A cushion, or pad, must be provided, to fill completely the space
between the top of the packing material and the cover of the box after
the kettle is in place. This should be made of some heavy goods, such as
denim, and stuffed with cotton, crumpled paper, or excelsior. Hay may be
used, but it will be found more or less odorous. Figure 43 shows the
vertical cross-section of a home-made fireless cooker.
[Illustration: _Fig._ 43.--Vertical cross-section of fireless cooker. A.
Outside container; B. packing or insulating material; C. metal lining of
nest; D. cooking kettle; E. soapstone plate, or other source of heat; F.
pad of excelsior for covering top; G. hinged cover of outside
container.]