Code Number: 8C20.30
Demo Title: Saddle Shape
Condition: Good
References:
- Charles A. Eckroth, "Astro Notes: Model of a Negatively Curved Two‐Dimensional Space", TPT, Vol. 33, #5, May 1995, p. 286.
- P. K. MacKeown, "Gravity is Geometry", TPT, Vol. 22, #9, Dec. 1984, p. 557.
- Joseph A. Keane, "A Can of Negative Space", TPT, Vol. 16, #1, Jan. 1978, p. 8.
- Rev. Myron Effing, "Squashed Space: An Activity Concerning General Relativity", TPT, Vol. 15, #5, May 1977, p. 298.
- Wolfgang Rueckner, Justin Georgi, Douglass Goodale, Daniel Rosenberg, and David Tavilla, "Rotating Saddle Paul Trap", AJP, Vol. 63, #2, Feb. 1995, p. 186.
- R. Mark Wilson, "Custom Shapes from Swell Gels", Physics Today, Vol. 65, #5, May 2012, p. 15.
- Rachel Feltman, "What Shape is the Universe?", Popular Science, Vol. 291, Fall 2019, p. 18.
- Jim Glenn, "Karl Friedrich Gauss", Scientific Genius: The Twenty Greatest Minds, p. 60 - 64.