Geometric Model by A. Harry Wheeler, Supplementary Trihedral Angles
date: label: date made
content: 1927 05 29
name: label: maker
content: Wheeler, Albert Harry
notes: label: Description
content: Three planes that meet at the center of a sphere form what is called a trihedral (three-sided) angle. Each plane intersects the sphere in a great circle. Segments of these three circles form a spherical triangle on the sphere. In this cut and folded tan paper model, Wheeler labels the vertices of this triangle ABC. Consider a point (not named by Wheeler – call it X) inside the bounds of the trihedral angle and drop perpendiculars to the three sides of the trihedral angle through it. Wheeler calls the points of intersection D, E, and F. The trihedral angle centered at X is the supplement of the original trihedral angle.
label: Description
content: Reference:
label: Description
content: D. A. Low, <I>Practical Geometry and Graphics</I>, New York: Longmans, Green and Co., 1912, pp. 233-235.
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
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content: Trigonometry
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content: Science & Mathematics
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content: Spherical Trigonometry
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.304723.195
label: accession number
content: 304723
label: catalog number
content: 304723.195
objectType: label: Object Name
content: Geometric Model
physicalDescription: label: Physical Description
content: paper (overall material)
label: Physical Description
content: tan (overall color)
label: Physical Description
content: cut and folded (overall production method/technique)
label: Measurements
content: average spatial: 7 cm x 7.3 cm x 6 cm; 2 3/4 in x 2 7/8 in x 2 3/8 in