A lithobolos (Greek: λιθοβόλος) refers to any mechanical artillery weapon used and/or referred to as a stone thrower in ancient warfare. Typically this referred to engines that propel at stone along a flat track with two rigid bow arms powered by torsion (twisted cord), in particular all sizes of palintonon.
However, Charon of Magnesia referred to his flexion (bow) stone-thrower engine, a 9 feet (2.7 m) gastraphetes shooting 5–6 mina (5 pounds, 2.3 kg), as a lithobolos; Isidoros of Abydos reportedly built a larger 15-foot (4.6 m) version shooting 40-pound (18 kg). Also, the euthytonon, a single-arm torsion catapult, was referred to by contemporaries as a stone-thrower, as was its Roman evolution the onager.
Stone-throwers of the same class looked alike, with their stone capacity scaling mostly with overall size. Machine dimensions can be approximated mathematically based on the equivalent spring diameter.
The first recorded Indo-European stone-thrower machines were used by the armies of Philip of Macedon and Alexander the Great. Polydias, Charias, and Diades of Pella, are the three engineers recorded designing machines for these armies, with Diades engineering at the sieges of Halicarnassus (334 BC) and Gaza (332 BC).
According to the Hellenistic engineer Philo of Byzantium, the common effective range against fortifications was 150 metres (490 ft) with a load of 27 kilograms (60 lb); at that distance, walls had to be 5 metres (16 ft) thick to withstand the impact. Anti-personnel stonethrowers hurled much smaller balls, though arrow-shooters like the scorpio were preferred for these purposes. Super-heavy stonethrowers such as those fielded by Demetrius "Poliorcetes" at the Siege of Rhodes (305 BC) threw stones of up to 75 kilograms (165 lb) and could be brought close to the walls in siege-towers. Balls of such size were found in small numbers in the arsenals of Carthage and Pergamon, corroborating ancient reports of their use. The Roman artillery engineer Vitruvius provided measurements for even more powerful stone-throwers, but it is not known whether these were ever used in combat. Modern experiments show that smaller projectiles could be hurled at least 400–500 metres (1,300–1,600 ft), while ancient authors record maximum ranges of as much as 700 metres (2,300 ft).
Siege engines of all types have been recorded as mounted on ships, with perhaps their first successful use at the Battle of Salamis (306 BCE) under the command of Demetrius "The Besieger". The enormous transport Syracusia possibly had the largest ship-mounted catapult of the ancient world, an 18-foot (5.5 m) machine that could fire arrows or stones up to 180 pounds (82 kg).
During the Siege of Syracuse (214–212 BCE), the Greek defenders used a barrage of machines developed by Archimedes, including powerful stone-throwing ballistas. Archimedes had the record for the largest stone launched in the ancient world, from a ship-mounted engine, reported at 3 talents (78 kilograms, 172 lb).
The Roman onager, a catapult powered by rope torsion, was sometimes referred to as a stone-thrower.
Archimedes reportedly designed a steam-powered gun to shoot spherical projectiles using the same principle of gas pressure as a gunpowder cannon. Leonardo da Vinci drew a design for a steam gun that he named "Architronito", citing Archimedes.
Aristotle first observed the phenomenon aerodynamic heating in the slight melting of the face of lead bullets thrown from ancient catapults and ballistas, using this to make some correct deductions of the physics of gases and temperature.
- Head, Duncan (2012). "186". Armies of the Macedonian and Punic Wars. p. 340. ISBN 978-1-326-56051-5.
- Lahanas, Michael. "Ancient Greek Artillery Technology from Catapults to the Architronio Canon". www.hellenicaworld.com. Retrieved 2018-03-30.
- Warry, John Gibson (2000). Warfare in the Classical World. p. 78. ISBN 978-0-760-71696-0.
- Lanahas cites: Aristotle (1930) [350 BCE]. On the Heavens. 2. Translated by Stocks, JL. § 7. Retrieved 2008-03-30.
[M]issiles, which as they move are themselves fired so strongly that leaden balls are melted; and if they are fired the surrounding air must be similarly affected.
- Suleski, Kurt (Darius Architectus). "Siege Engine Blueprints". Archived from the original on 2011-02-27. Source cited for blueprints. Source cited for images.
- Suleski, Kurt (Darius Architectus) (1997). "Ballista construction". Knight's Armory. Archived from the original on 2006-04-27 – via BBC/TLC/Discovery's Building The Impossible: The Roman War Machine (2003). More photos and details at "Legion XXIV – Greek Palintone Torsion-Powered Siege Catapult". Histoire Antique par Fabrice Mrugala. Retrieved 2018-03-30.
- Legion XXIV made Palintonon reconstruction.
- Digital reproduction ad with diagrams: "The Lithobolos". Arx Loricatus. § 6. Archived from the original on 2011-07-18.
- Palintonon image.