Surface string model

1872

Conoid surface model

1872

Surface string model, 1872.

1872

Staircase vault for a square wall

1872

Deformation of a cylinder, surface string model

1872

Hyperbolic paraboloid; a skew quadrilateral

1872

Hyperboloid surface string model

1872

Model to show two intersecting planes

1886-1888

Model showing a pair of cones enveloping a sphere and a plane

1886-1888

Skew surface with its tangent paraboloid surface string model

1872