Rasmus Malling-Hansen, Hansen Writing Ball, launched 1870.
Nietzsche did buy the shown model directly from Hansen 1882 and wrote his letters with the “Schreibkugel” as he was almost blind at this time. Via Klassik Stiftung Weimar. 2 Patent application by Hansen. The Ball won lots of honors at the World Exhibition 1872 but never became a commercial success. Source. 3 Student project of Felix Herbst, interactive 3D presentation of Nietzsche’s model ©Felix Herbst Source
(via semina50)Source: design-is-fine