KING'S COLLEGE LONDON / SCIENCE PHOTO LIBRARY KING'S COLLEGE LONDON / SCIENCE PHOTO LIBRARY
Surveying instrument. Jacob's staff (Baculus Jacob) or cross-staff towards the top window of a stone tower. This device was an early surveying instrument used to measure angles, heights, and distances. This woodcut is from 'Margarita philosophica' (1503). This work, by the German author Georg Reisch (c.1467-1525), was an encyclopedic compilation of knowledge that became one of the standard textbooks of the time. The topics in its twelve books included grammar, dialectics, rhetoric, arithmetic, music, geometry, astronomy, physics, natural history, physiology, psychology, and ethics.
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