Surface of 4. order with 4 planes touching along circles
Model 126
Description
The surface consists of 4 congruent parts cohering in 6 biplanar double points. The corresponding pairs of tangent planes are real. Gypsum.
Showcase of this model is Case number 3
References
Schilling, Martin(Hrg.): Catalog mathematischer Modelle, Leipzig(Verlag von Martin Schilling) 1911, 7.Auflage, No.98. p. 125.
Fischer, Gerd(Hrg.): Fotoband: Mathematische Modelle / Mathematical Models, mit 132 Fotografien, Braunschweig/Wiesbaden (Vieweg) 1986, picture(s) 40. .
Fischer, Gerd(Hrg.): Mathematical Models, Commentary, Braunschweig/Wiesbaden(Vieweg) 1986. .
Separataband M1 im Mathematischen Institut p. 171.