Example image of eyePlorer eyePlorer map for 'Polybolos': Ballista Classical antiquity Catapult Chain drive Gear Machine gun Philo of Byzantium Archaeology Leonardo da Vinci Windlass Greek language Scorpio (dart-thrower) Fathullah Shirazi Autocannon Repeating crossbow Roman military engineering Cannon in the Middle Ages History of cannon Cannon Roman siege engines History of gunpowder Mughal Empire Early Modern warfare Gunpowder List of Chinese inventions