A man
grabbed what was the long edge of the sheet of cardboard,
now divided in two by the half circle cut from it. The two
now separate edges are now brought together to form a cone.
The cone has no tip because of the cut-out half-circle.]
3. Glue Foil to Cardboard. Apply glue or adhesive to the top
(inner) surface of the cardboard, then quickly apply the aluminum
foil on top of the glue, to affix the foil to the cardboard.
Make sure the shiniest side of the foil is on top, since this
becomes your reflective surface in the Funnel. I like to put
just enough glue for one width of foil, so that the glue stays
moist while the foil is applied. I also overlap strips of foil
by about 1" (or 2 cm). Try to smooth out the aluminum foil
as much as you reasonably can, but small wrinkles won't make
much difference. (If even cardboard is not available, one can
simply dig a funnel-shaped hole in the ground and line it with
a reflector, to make a fixed solar cooker for use at mid-day.
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