model_creation_date 1883
model_size 12 x 5
model_weight 240
model_catalognum IX 7, 87
model_objectnum 97697-000
model_originalprize 7,00
model_since 02.12.1960.
model_from :
nav_classification
Ring cyclides with intersection curves of double-touching planes
In addition to the two sets of curvature lines, each ring cyclide carries another real family of conic sections: the intersection curves of the double tangent planes. Examples from all three sets of circles are shown here.