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TWELVE STARS JOINED
Some facts about the Star Dome 1-A sphere:
1. The 12 stars are made from 60 tubes- 5 tubes bent strategically and drilled for attaching make up one star. (15 struts each, total 180 struts). These make 10 geodesic "great circles".
2. 60 tubes make up the Star Centers and half of the struts in the hexagons between the stars (total 120 struts).
3. 30 tubes make the final struts that complete this sphere (total 60).
4. The complete sphere is made up of 150 separate tubes, that make up the 360 struts.
5. It was all fabricated with simple tools including a manual hydraulic press and drill press (we now use an electric hydraulic 40 ton press), and took 2 weeks to measure, saw, flatten tube ends, drill holes, etc.
6. It was a prototype resulting in a very strong sphere structure. Several Geo-Spheres of various types from 3 to 12 ft have since been constructed.
But then other advantages are described:
"The geodesic dome, as we have seen, is supported by tension, and the tension networks are most economical when their strands run for considerable distances without changing direction. This means aligning sequences of vertices along great-circle arcs." page 70-71
Note: Buckyworks by J. Baldwin contains a photograph of
Bucky next to one of these early great circle domes.
Daniel's Geo-Sphere swing: Photo | Daniel's Treehouse
P o l y h e d r a
can be constructed into domes and Geo-Spheres.
The Geometry Center, University of Minnesota site
shows several polyhedra with mid-edge and in-centers of faces joined.
These become geodesic great circle dividing lines and in the case of building structures,
triangle strength is added.
For instance the first image is the dodecahedron, which projected to the sphere surface becomes the Dodeca-Dome