Divina proportione : die Lehre vom goldenen schnitt
A 1889 Vienna edition by Constantin Winterberg of Luca Pacioli's Renaissance treatise on proportion, published by C. Graeser for a readership of artists and mathematicians. The pictures are plain geometric line diagrams: a pentagon inscribed in a circle with labelled vertices, a semicircle with a perpendicular, and a square set within a circle with construction lines. A designer could borrow their clean compass-and-straightedge construction logic for layouts that rely on golden-section ratios.
