Featured on PDR in the collection Angles of Reconnaissance: Novum Instrumentum Geometricum (1607)

Written by Leonhard Zubler, a Swiss goldsmith and instrument maker who is credited with popularizing the use of the plane table as a tool for surveying, Novum instrumentum geometricum illuminates the shared history of land-surveying and militaristic range-finding technologies. The text is intercut with elaborate copperplate engravings that showcase the might of trigonometry and triangulation in the immediacy of conflict. Bombardiers pack canons that are aimed with advanced precision at distant towers; the construction of ornate fortifications are planned with ease thanks to geometric instruments; and seemingly insurmountable crags are brought down to earth through the surveyor’s sightline. Readers are promised that they will learn how to measure the width of a moat or the height of wall in order to breach them more efficiently.