Das Zeichnen an den allgemein bildenden Schulen mit besonderer Berücksichtigung der preußischen Lehrplanbestimmungen
A German-language 1905 textbook by Heinrich Grothmann on drawing instruction in general secondary schools, with reference to Prussian curriculum rules, held by Heidelberg University Library. Its pictures are plain line drawings of everyday objects and simple child-like sketches, showing how basic forms are reduced to clean outlines that a designer could use for schematic icons or teaching-style diagrams.
