D. Galilaei de Galilaeis ... De proportionum instrumento a se invento, quod meritò compendium dixeris universae geometriae, tractatus, rogatu philomathematicorum a Mathia Berneggero ex italica in latinam linguam nunc primùm translatus : adjectis etiam notis illustratus, quibus & artificiosa instrumenti fabrica, & usus ulterior exponitur
A 1613 Latin treatise by Galileo Galilei, translated by Mathias Berneggerus and printed at Strasbourg, explaining his geometric and proportional compass for mathematicians and instrument makers. The diagrams are plain line drawings of right triangles, lettered angles and sight lines built on the instrument's scales, showing how a designer might sketch measurement geometry: thin, precise strokes with labelled points and arcs.
