# Curvature centre point surface of the triaxial ellipsoid

### Model 239

### Description

Curvature centre point surface of the triaxial ellipsoid. a) Gypsum; curved surfaces are disjoined; b) Gypsum; curved surfaces are unified. c,d) the same in plasticene.

Showcase of this model is Case number 43

### References

*Separataband M3 im Mathematischen Institut* p. 441.