Line the bottoms and sides of all three boxes with sheet asbestos. In
the bottom of the long box lay newspapers flat to a depth of about half
an inch. Put two inches of sawdust on top of this layer of newspapers.
Place the two square boxes inside the long one, leaving at least two
inches of space between them. Fill all the spaces between the boxes with
sawdust. Tack strips of denim or other material so that they will cover
all the spaces that are filled with sawdust.
The outside box must have a hinged lid, which must be fastened down with
a clasp. Line the lid with the sheet asbestos to within half an inch of
the edge. Put a layer of sawdust one inch deep on top of the asbestos.
Tack a piece of denim or other material over the sawdust, still leaving
the edge free and clear so that the cover may fit tightly; or the lid
may be lined with asbestos and a denim pillow filled with sawdust made
to fit tightly into the top of the box.