)
[Image: 06.jpg-- Photo description: two men are spreading
a sheet of aluminum foil across a rectangular sheet of cardboard.]
4. Join side A to side B to keep the funnel together. The easiest
way to do this is to punch three holes in the cardboard that line
up on side A and side B (see figure). Then put a metal brad
through each hole and fasten by pulling apart the metal tines.
Or you can use a nut-and-bolt to secure the two sides (A &
B) together.
Be creative here with what you have available. For example,
by putting two holes about a thumb-width apart, you can put a
string, twine, small rope, wire or twist-tie in one hole and
out the other, and tie together.
When A and B are connected together, you will have a "funnel
with two wings". The wings could be cut off, but these help to
gather more sunlight, so I leave them on.
[Image: 07.jpg -- Photo description: This photo shows the
outside edge of the cone where the edges of the cardboard
meet. Two people are securing the edges together.
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