Triangulation, c 1606.
© Science Museum / Science & Society Picture Library
Two illustrated plates taken from 'The Workings of the Military and Geometric Compas' (1606) by Galileo Galilei (1564-1642). Galileo's treatise on the use of the compas was published in Padua, Italy in 1606, following a dispute with Simon Marius (1570-1624), a fellow profesor at Padua, who Galileo accused of plagiarising his proportional compas. Galileo succesfully brought action against a pupil of Marius, Baldasar Capra, after Marius had returned to Germany.