Great Icosahedron

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This model of a great icosahedron is made of metal painted gray. A rod from one of the vertices extends down to a round wooden stand painted black. No maker's marks are on the model or the base. Most though not all of the small triangular sections that form the faces are marked in pencil: V. These sections join to form twenty identical intersecting faces.The twelve vertices are also identical. The surface was first described by the Frenchman Louis Poinsot in 1809 and is now known as a Kepler-Poinsot solid.
Paper versions of this surface, made by students of A. Harry Wheeler, are also in the NMAH collections.
Compare models MA.304723.26, MA.304722.27, and MA.304722.28.
H. M. Cundy and A. P. Rollet, Mathematical Models, Oxford: The Clarendon Press, 1961.
Currently not on view
Physical Description
wood (overall material)
metal (overall material)
overall: 27 cm x 13.5 cm x 13.5 cm; 10 5/8 in x 5 5/16 in x 5 5/16 in
ID Number
catalog number
accession number
Credit Line
Gift of Brown University Department of Mathematics
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Data Source
National Museum of American History


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