LSE4101339 Catapult and Hook System - Manuscript: parchment sheet of an engineer\'s manual for the construction of civil, religious and military buildings, anonymous, late 15th century (figure in Chinese ink) by Unknown Artist, (15th century); Abbey of St. Peter, Solesmes, France; (add.info.: Catapult and Hook System - Manuscript: parchment sheet of an engineer\'s manual for the construction of civil, religious and military buildings, anonymous, late 15th century (figure in Chinese ink)); Photo by Leonard de Selva.