Models of rubric: Helicoids, sliding surfaces, curves and surfaces of constant breadth Model 64 Developable helicoid Model 65 Standard helicoid Model 66 Standard helicoid Model 67 Standard helicoid Model 68 Developable helicoid Model 68 Developable helicoid Model 69 Helicoid of constant negative curvature Model 70 Pipe helicoid with curve lines Model 71 Helical surface Model 151 Chord central point area of a space curve of 4. order. Model 184 Helicoid of constant positive curvature Model 191 Oblate rotational ellipsoid Model 192 Helicoid Model 221 Measuring apparatus for surfaces of constant width Model 222 Surface of constant width Model 223 Surface of constant width Model 224 Surface of constant width Model 225 Curves of constant width Model 226 Curve of constant width Model 228 Measuring apparatus for curves of constant width Model 229 Surface of constant width Model 230 Measuring apparatus for curves of constant width Model 231 Curve of constant width Model 232 Curve of constant width Model 233 Curve of constant width Model 234 Areas and curves of constant width and constant perimeter Model 243 Helical surface Model 243 Helical surface Model 378 Helical surface Model 379 Developable helicoid and cylinder through the edge of regression Model 1006 Slide: Cambered helicoid Model 1007 Slide: Crooked closed helicoid Model 1008 Slide: Developable helicoid Model 1009 Slide: Devoured helicoid Model 1010 Slide: Orthogonal helicoid
Göttingen Collection of Mathematical Models and Instruments
Göttingen Collection of Mathematical Models and Instruments
Developable helicoid
Standard helicoid
Standard helicoid
Standard helicoid
Developable helicoid
Helicoid of constant negative curvature
Pipe helicoid with curve lines
Helical surface
Chord central point area of a space curve of 4. order.
Helicoid of constant positive curvature
Oblate rotational ellipsoid
Helicoid
Measuring apparatus for surfaces of constant width
Surface of constant width
Surface of constant width
Surface of constant width 
Curves of constant width
Curve of constant width
Measuring apparatus for curves of constant width
Surface of constant width
Measuring apparatus for curves of constant width
Curve of constant width
Curve of constant width
Curve of constant width
Areas and curves of constant width and constant perimeter
Helical surface
Helical surface
Developable helicoid and cylinder through the edge of regression
Slide: Cambered helicoid
Slide: Crooked closed helicoid
Slide: Developable helicoid
Slide: Devoured helicoid
Slide: Orthogonal helicoid