Other Model of a periodic surface (Minimal surface ?) Punch cards to the factorization of big integers Folder with a state examination thesis Folder for the illustration of the projective mapping of two lines Exercises for descriptive geometry Average temperature of Göttingen for the 24 hours of the day and each month Model Tensegrity Four models with unknown meaning Four models with unknown meaning Four models with unknown meaning Four models with unknown meaning Surface Shift planner 15puzzle Slide: Piston pump Slide: Rotation rapid press for four-sided journals Slide: Oldham coupling Slide: Turning lathe Slide: Basic rapid press with circular motion Slide: Mechanism of the circular motion Slide: Gimbal Slide: Optic illusion Slide: Projection machine Slide: Projection machine Slide: Projection machine Slide: Projection machine Slide: Stereoscopy Slide: Stereoscopy Slide: Stereoscopy Slide: Stereoscopy Slide: Stereoscopy Slide: Stereoscopy Slide: Line spectra Slide: Line spectra Slide: Line spectra Slide: Line spectra Slide: Line spectra Slide: Line spectra Slide: Line spectra Slide: Obscure airplanes Slide: Obscure airplanes Slide: Obscure airplanes Slide: Obscure airplanes Slide: Obscure airplanes Slide: Obscure airplane Slide: Obscure airplane Slide: Obscure airplane Slide: Obscure airplane Slide: Obscure airplane Slide: Obscure airplane Slide: Obscure airplane Slide: Obscure airplane Slide: Obscure airplane Slide: Obscure airplane Slide: Obscure airplane