Geometric Model, Ruled Surface in Cylinder


Like several other models made by the Jesuit mathematician Joseph F. MacDonnell of Fairfield University, this model shows a surface swept out by a moving straight line. Such a surface is called a ruled surface. It is represented by the cylindrical coordinates (r, t, z) by the equation r = a + z tan (pt/q). The model has a clear plastic cylindrical exterior, with pink plastic threads inside it that represent the surface. Here the ratio p/q = 1/3 and the fraction 1/3 is marked on the outside of the cylinder.

Maker: MacDonnell, S.J., Father Joseph

Location: Currently not on view

Place Made: United States: Connecticut, Fairfield

Subject: Mathematics


See more items in: Medicine and Science: Mathematics


Exhibition Location:

Credit Line: Gift of Father Joseph MacDonnell, S.J.

Data Source: National Museum of American History

Id Number: 1986.3075.02Nonaccession Number: 1986.3075Catalog Number: 1986.3075.02

Object Name: geometric model

Physical Description: plastic (overall material)Measurements: overall: 25.5 cm x 10.2 cm x 10.2 cm; 10 1/32 in x 4 1/32 in x 4 1/32 in


Record Id: nmah_690338

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