Boxes to be filled with the second class of material are packed in the
following manner:
Line the box with a smooth covering of paper or asbestos, tacked into
place. Pack a layer of insulating material, three inches or more in
thickness, in the bottom, laying a piece of heavy paper on this. Sew two
or three thicknesses of pliable cardboard into the form of a cylinder
that will fit around the utensil loosely. (Fig. No. 1.) It must be of
the same height as the kettle. Set this cooker-pail, surrounded by the
cylinder, on the layer in the box. Holding the kettle in place with one
hand, pack tightly around it, to the level of the top of the pail. (See
page 12.) The efficiency of the box depends largely upon this packing.
Cut a round hole, the size of the cooker nest, in a piece of heavy
pasteboard, to fit the top of the box. Lay this over the packing, so
that it will cover it completely. The box is now ready for its cloth
lining. To make this, cut three pieces of cloth; one to be one-inch or
more larger than the top of the box, with a round hole cut in its
centre, one inch smaller than the diameter of the cooker-pail (Fig. No.
2:1); another to be a round piece one-inch larger than the diameter of
the pail (Fig. No. 2:2); and the third to be a strip one-inch wider than
the height of the pail, and long enough to go around it with an inch to
spare (Fig. No. 2:3). Sew the ends of this strip together to make a
cylinder. Into one end of this cylinder sew the round piece. The other
end is to be sewed into the large piece, taking in each case a half-inch
seam. When this is put into the box it will line the nest for the
kettle, and cover the pasteboard which rests on top. (Fig. No. 3.)
Remove the pail and tack this cloth lining in place, turning in the
edges where it is tacked to the box. A paper lining may be substituted
for cloth in the following manner:
[Illustration: Figure No. 4.