Geodesic dome "transmigration" method is based so specifically on dome design that only fixed numbers of people can take part in the process at each deliberation stage. Many geodesic domes are among the largest clear-span structures in the world. According to the Buckminster Fuller Institute in 2010, the world's 10 largest geodesic domes by diameter are: One other large dome in Venezuela was missed on the original Fuller Institute list, while two others built later are also now in the top 10. Currently, several geodesic domes are larger than 113 m in diameter. Geodesic dome A geodesic dome is a hemispherical thin-shell
Geodesic dome resists sun and weathering. Some form of internal flashing or caulking must be placed over the joints to prevent drafts. The 1963 Cinerama Dome was built from precast concrete hexagons and pentagons. Given the complicated geometry of the geodesic dome, dome builders rely on tables of strut lengths, or "chord factors". In "Geodesic Math and How to Use It", Hugh Kenner writes, "Tables of chord factors, containing as they do the essential design information for spherical systems, were for many years guarded like military secrets. As late as 1966, some 3"ν" icosa figures from "Popular Science Monthly" were all anyone