Serie XII; Four stringmodels, with a space curve of order four of the first kind and its developed surface

Number Title Date of Design Dimension (cm) Material
Serie XII, nr. 1 First case, the curve lies on four real cones. Representation of the curve as the intersection of the cones. 1884 30-30-30 String
Serie XII, nr. 2 First case, a ruled surface of the tangents of a curve. 1884 30-30-30 String