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Website
The Math Forum: Ask Dr. Math: Constructing an Ellipse Website
National Council of Teachers of Mathematics

The Math Forum: Ask Dr. Math: Constructing an Ellipse

For Students 9th - 10th
Dr. Math, in a reply to a student question, mentions how you can construct an ellipse using string and thumbtacks.
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Activity
University of Illinois Urbana Champaign: Chickscope Egg Math: The Shape of an Egg Activity
University of Illinois

University of Illinois Urbana Champaign: Chickscope Egg Math: The Shape of an Egg

For Students 9th - 10th
Drawing a perfect ellipse with pins and string is demonstrated with a java simulation.
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