1) Drawing board with paper attached.
2) T square.
3) 2 tacks.
4) String or wire. It should have as little stretch as possible.
5) A pencil.
Place one tack at the focus of the parabola and the other on the end
of the T square long bar
Then place the T Square so it rides on the bottom of the drawing board
and moves left to right.
Tie the string to the T-square tack and tie the other end to the tack
in the paper.
Place the T-square near the paper tack and hold a pencil on the vertical
portion of the T-square.
Slide the T-square to the right and allow the pencil to move along the
edge of the T-square.
The resulting curve will be a parabola
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