Model by Richard P. Baker, Dual of Model 438, Baker #438a


This geometric model was constructed by Richard P. Baker in the early twentieth century when he was Associate Professor of Mathematics at the University of Iowa. Baker believed that models were essential for the teaching of many parts of mathematics and physics, and over 100 of his models are in the museum collections.

This painted wire structure includes six directional arrows. It has a paper tag that reads: No. 438* (/) Dual of 438. Although the inscription denotes the model as 438*, Baker's catalog lists it as 438a.

Baker built nine models to correspond to figures described by the German mathematician Eduard Study in his book on the geometry of dynamics (in his catalog, Baker shortened the title to Dynamen). Examples with numbers MA.211257.089 and MA.211257.090 (this one) relate to finding the sum of spherical wedges.


Study, E., Geometrie Der Dynamen: Die Zusammensetzung Von Kräften Und Verwandte Gegenstände Der Geometrie Bearb., Leipzig: B.G. Teubner, 1903, esp. pp. 34-35.

Baker,R.P., Mathematical Models, Iowa City, 1931, p. 16.

Date Made: ca 1906-1935

Maker: Baker, Richard P.

Location: Currently not on view

Place Made: United States: Iowa, Iowa City

Subject: Mathematics


See more items in: Medicine and Science: Mathematics, Science & Mathematics


Exhibition Location:

Credit Line: Gift of Frances E. Baker

Data Source: National Museum of American History

Id Number: MA.211257.090Accession Number: 211257Catalog Number: 211257.090

Object Name: geometric model

Physical Description: metal (overall material)beige (overall color)soldered. (overall production method/technique)Measurements: average spatial: 10.6 cm x 19.1 cm x 10.2 cm; 4 3/16 in x 7 17/32 in x 4 1/32 in


Record Id: nmah_1087146

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