How can I build a model that makes hyperbolas?

my teacher has an easy ellipse maker thats just a piece of wood and some nails. he will give alot of points if someone brings one for a hyperbola, people said that it exists but I can't seem to find it anywhere on the internet. can someone please help me find the directions of how to construct one?

Answer:
http://www.ies.co.jp/math/java/conics/dr...
http://dspace.library.cornell.edu/bitstr...
http://www.sciences.univ-nantes.fr/physi...
http://www.hineslab.com/mathconicsection...
http://homepage.mac.com/dscher/vhyp.html...

A continuous drawing can be made as follows: let F, F' be the foci of
the hyperbola. Take a ruler, say of length m, with end points Q and R.
Attach one end of a string of length m - 2c to R and the other end to F.
Pin the extreme Q of the ruler to F', so that the ruler can pivot around F'.
Now tighten the string with the tip of a sharp pencil, touching the rule
at the same time say at a point P.

see picture at link below

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How can I build a model that makes hyperbolas?

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