XJF308767:
Suggestions on how to construct a bastion at night, fol. 70r from Paris Manuscript B, 1488-90 (pen & ink on paper), Vinci, Leonardo da (1452-1519) / Bridgeman Images
GIA4794248:
Study for a war machine Escorpio by Leonard de Vinci (Leonardo da Vinci) (1452 - 1519). Drawing with pen and ink., Vinci, Leonardo da (1452-1519) / Bridgeman Images