Horopter curve (cubic ellipse)
Model 51
Description
Horopter curve (cubic ellipse in its application on physiologic optics). Brass wire.
Showcase of this model is Case number 36
References
Schilling, Martin(Hrg.): Catalog mathematischer Modelle, Leipzig(Verlag von Martin Schilling) 1911, 7.Auflage, No.157. p. 133.
Separataband im Mathematischen Institut, D13, Ludwig,W. p. 1.