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Title: Model of a surface whose horizontal sections exhibit double [Go to resource]
Description: Model of a surface whose horizontal sections exhibit double points; the points lie on a parabola in a vertical plane and progress in succession through the forms: nodes, cusp, conjugate points, cusp and nodes License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: surface model (plaster) Source: Science Museum Identifier: 1936-288/2 Go to resource More Like this...
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