1L20.50 - Ellipse Maker
See also 1L20.50 in Astronomy.
In LR I and LR II just attach the ellipse maker to the magnetic chalk boards. The large donut magnets that are on the maker will limit the eccentricity that you will be able to achieve. In LR 70 you will have to use the portable white board and the magnetic attachments that are available. Chalkboards in that room are not magnetic.
- Barbara Rovsek, "How Eccentric Is the Orbit of the Earth, and Where Is the Sun?", TPT, Vol. 59, #6, Sept. 2021, p. 438.
- Thomas B. Greenslade Jr., "Using Physics to Solve a Mystery", TPT, Vol. 47, #1, Jan. 2009, p. 4.
- Jeffrey Prentis, Bryan Fulton, Carol Hesse, and Laura Mazzino, "Elliptical Orbit - 1/r2 Force", TPT, Vol. 45, #1, Jan. 2007, p. 20.
- Jorge Sztrajman and Agustin Rela, "Optical Property of the Ellipse Derived from Energy Conservation", TPT, Vol. 41, #4, Apr. 2003, p. 208.
- H. Richard Crane, "Simple Devices That Fascinate - But Only Some People", TPT, Vol. 31, #2, Feb. 1993, p. 120.
- S. D. Baker, "Short Visual Quiz on Ellipses", AJP, Vol. 53, #8, Aug. 1985, p. 790.
- S-400, "Acrylic Drawing Aids", DICK and RAE Physics Demo Notebook.
- Tik Liem, "The Elliptical Wonder", Investigation to Science Inquiry, p. 312.
- Martin Gardner, "Draw A Perfect Ellipse", Entertaining Science Experiments with Everyday Objects, p. 56.
- Janice VanCleave, "How Far?", Astronomy for Every Kid - 101 Easy Experiments That Really Work, p. 60 - 61.
- Jim Glenn, "Elliptical Thinking", Scientific Genius: The Twenty Greatest Minds, p. 28.
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