Surfaces of Gaussian Curvature Zero - Map Projections: Cartographic Information Systems - page 180

Fig. 4.3. Gauss flat surface ( k = 0) of type plane. Here: tangent plane of the sphere attached to the North Pole:
“developable”
Fig. 4.4. Gauss flat surface ( k = 0) of type cylinder. Here: cylinder wrapping the sphere, equator is the line-of-
contact: “developable”
Fig. 4.5. Gauss flat surface ( k = 0) of type conus. Here: cone wrapping the sphere, a special parallel circle is
the line-of-contact: “developable”