Henrici Glareani Heluitii, poetae laureati de geographia liber unus,
Henricus Glareanus, a Swiss-born poet laureate, wrote this 1543 Latin treatise on geography, printed at Freiburg im Breisgau, for scholars and students of the subject. Its pictures are plain geometric diagrams: a ringed astronomical instrument with lettered divisions, nested circles bisected by crossing lines, and a half-circle construction with parallel rules, showing how lettered rings and lines were used to plot positions. A designer could take the rigorous, labelled diagram style and its radiating line structures as a model for technical schematics.
