Geometric Model by A. Harry Wheeler, Tetrahemihexahedron or Heptahedron
name: label: maker
content: Wheeler, Albert Harry
notes: label: Description
content: This clear plastic model.is in the shape of a regular octahedron but has four alternating faces removed and replaced by inward-facing triangular pyramids. It is held together with plastic string.
label: Description
content: An inscription reads: e=6 (/) k=12 (/) f=7 (/) e-k+f=1. In other words, the Euler characteristic of the model indicates that it is a one-sided polyhedron.
label: Description
content: Wenninger calls this surface a tetrahemihexahedron, Wheeler called it a heptahedron (it has seven faces). Wheeler also assigned the model nmber M1 and number 642.
label: Description
content: Compare 1979.0102.175, 1979.0102.176, 1979.0102.177, 1979.0102.190, 1979.0102.203, 1979.0102.272, 1979.0102.304, MA.304723.366, MA.304723.380, MA.304723.387, and MA.304723.419.
label: Description
content: Reference:
label: Description
content: Magnus J. Wenninger, <I>Polyhedron Models</I>, Cambridge: The University Press, 1971, p. 101.
label: Description
content: A.H. Wheeler, <I>Catalog of Models</I>, A. H. Wheeler Papers, Mathematics Collections, National Museum of American History.
label: Location
content: Currently not on view
place: label: place made
content: United States: Massachusetts, Worcester
topic: label: Subject
content: Mathematics
setName: label: See more items in
content: Medicine and Science: Mathematics
label: See more items in
content: Science & Mathematics
creditLine: label: Credit Line
content: Gift of Helen M. Wheeler
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: MA.304723.366
label: accession number
content: 304723
label: catalog number
content: 304723.366
objectType: label: Object Name
content: Geometric Model
physicalDescription: label: Physical Description
content: plastic (overall material)
label: Physical Description
content: green (overall color)
label: Physical Description
content: cut and glued (overall production method/technique)
label: Measurements
content: average spatial: 11 cm x 7.5 cm x 7.5 cm; 4 11/32 in x 2 15/16 in x 2 15/16 in