Model of a Complex Determined from Five Lines by Ruler Only, by Richard P. Baker, Baker #236


This model was made by Richard P. Baker in the early twentieth century when he was on the faculty in mathematics at the University of Iowa. It consists of twelve intersecting wire line segments. Six segments are painted black, one green), three red, and two silver. A typed paper tag taped so that it goes around one edge reads: No. 236 (/) Complex from five lines.

Baker classified the model among those he designed to illustrate theorems in projective geometry, specifically "a complex determined from five lines by ruler only."

This example of the model was displayed at MIT from 1939, before its donation to the Smithsonian in 1956.


Baker, R.P., Mathematical Models, Iowa City, 1931, p. 14.

Accession file 211257.

Date Made: ca 1906-1935

Maker: Baker, Richard P.Baker, Richard P.

Location: Currently not on view

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.211257.042Accession Number: 211257Catalog Number: 211257.042

Object Name: geometric model

Physical Description: metal (overall material)red (overall color)green (overall color)yellow (overall color)purple (overall color)soldered (overall production method/technique)Measurements: average spatial: 8.6 cm x 21.1 cm x 16.9 cm; 3 3/8 in x 8 5/16 in x 6 21/32 in


Record Id: nmah_1082004

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