Eduard Imhof's atlases for Swiss High Schools:
Schweizerischer Mittelschulatlas - Atlas Scolaire Suisse pour l'Enseignement Secondaire - Atlante Svizzero per le Scuole Medie and for Swiss Primary School: Schweizerischer Sekundarschulatlas

In 1927 Eduard Imhof was asked to revise the atlas for Swiss high schools: Schweizerischer Mittelschulatlas. Subsequently the editions 1932-1976 were published under his direction in identical editions in German, French and Italian. From 1934-1975 the Swiss atlas for primary schools under the title "Schweizerischer Sekundarschulatlas" was published under Imhof's direction.

These atlases show the changes in our political world view. Besides that they are important evidence of Imhof's cartographic ideas. Adapted to the possibilities of the reproduction technique three main representations can be distinguished of which different examples are shown.
The landscape maps of Swiss areas on a large scale (up to about 1:500 000) were designed as watercolors and then reproduced like an artist's lithographies.

Up to 1958 the small scale maps were designed as maps with hachures, combined with hypometric colors. For the engraver the original drafts were designed as hill-shading maps, as pencil drawings on white paper. The hachures engraver for most of the maps was the well-known cartographer Oswald Winkel in Leipzig.

From the editions 1962 and later, all small-scale maps show hill-shading combined with hypsometric colors. These maps were drawn color-separated, only black and white, with pencil, ink and airbrush on white paper and reproduced as photo-lithographs. Finer screens made this technique now possible.