Model for the Horopter, a Space Curve of Order Three, by M. Schilling; No. 157, Ser. 28 No. 6
date: label: date made
content: 1902-1914
notes: label: Description
content: This is one of six models designed by Walter Ludwig of Breslau on the suggestion of Felix Klein and with the participation of Frederick Schilling. It illustrates the theory of cubic space curves as applied to physiological optics. The series first appeared in 1902.
label: Description
content: The metal model fits on a square wooden stand. It consists of a metal rod, a metal radius, a brass curve and a V-shaped copper-colored piece that moves along the curve. There are no marks on the object itself. A paper tag on the base reads: Horopter (/) 28 Serie, No. 6 (/) Verlag v. Martin Schilling, Halle a. S.
label: Description
content: According to the web site cited below, the horopter is a space curve of order three with equations:
label: Description
content: y = a
label: Description
content: z = xy
label: Description
content: In optics, it can be interpreted as the set of points for which the light falls on corresponding areas in the two retinas. It is a cubic ellipse on a cylinder with the same asymptote.
label: Description
content: References:
label: Description
content: Martin Schilling, <I>Catalog</I>, 1911, pp. 72-74, 133.
label: Description
content: The website showing the model collection of the University of Groningen at http://www.math.rug.nl/models/Serie28_nr6.html, accessed November 6, 2017.
label: Location
content: Currently not on view
place: label: place made
content: Germany: Saxony-Anhalt, Halle
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 Brown University Department of Mathematics
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: MA.304722.22
label: catalog number
content: 304722.22
label: accession number
content: 304722
objectType: label: Object Name
content: Geometric Model
label: Object Name
content: geometric model
physicalDescription: label: Physical Description
content: metal (overall material)
label: Physical Description
content: wood (overall material)
label: Measurements
content: overall: 46.7 cm x 20 cm x 23.3 cm; 18 3/8 in x 7 7/8 in x 9 3/16 in