Polybolos
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Thepolybolos(the name means "multi-thrower" inGreek[1]) was anancient Greekrepeatingballista,reputedly invented by Dionysius of Alexandria (a 3rd-century BCGreekengineer at theRhodesarsenal,[2][3]) and used inantiquity.The polybolo was not acrossbowsince it used atorsion mechanism,drawing its power from twisted sinew-bundles.[4]
Philo of Byzantium(c.280 BC –c.220 BC) encountered and described a weapon similar to the polybolos, acatapultthat could fire again and again without a need for manual reloading.[5]Philo left a detailed description of thegearsthat powered itschain drive(the oldest known application of such a mechanism[2]) and that placedboltafter bolt into its firing slot.[citation needed]
Design
[edit]The polybolos would have differed from an ordinary ballista in that it had a wooden hopper magazine, capable of holding several dozen bolts, that was positioned over the mensa (the cradle that holds the bolt prior to firing). The mechanism is unique in that it is driven by aflat-link chainconnected to awindlass.The mensa itself was a sliding plank (similar to that on the gastraphetes) containing the claw latches used to pull back the drawstring and was attached to the chain link. When loading a new bolt and spanning the drawstring, the windlass is rotated counterclockwise by an operator standing on the left side of the weapon; this drives the mensa forward towards the bow string. At the very front, a metal lug triggers the latching claws into catching the drawstring.[citation needed]
Once the string is held firm by the trigger mechanism, the windlass is then rotated clockwise; pulling the mensa back and drawing the bow string with it. At the same time, a round wooden pole in the bottom of the magazine is rotated via a spiral groove being driven by a rivet attached to the sliding mensa; dropping a single bolt from a carved notch in the rotating pole. With the drawstring pulled back and a bolt loaded on the mensa, the polybolos is ready to be fired. As the windlass is rotated further back to the very back end, the claws on the mensa meets another lug like the one that pushed the claws into catching the string. This one causes the claws to disengage the drawstring and automatically fires the loaded bolt. Upon the bolt being fired, the process is repeated. The repetition provides the weapon's name, inGreekπολυβόλος,"throwing many missiles",[6]fromπολύς(polys), "multiple, many"[7]and-βόλος(-bolos) "thrower", in turn fromβάλλω(ballo), "to throw, to hurl",[8]literally a multithrower.
Popular culture
[edit]In 2010, aMythBustersepisodewas dedicated to building and testing a replica, and concluded that its existence as a historical weapon was plausible. However, the machine MythBusters built was prone to breakdowns that had to be fixed multiple times.[9]
See also
[edit]References
[edit]- ^Prenderghast, Gerald (March 2018).Repeating and Multi-Fire Weapons: A History from the Zhuge Crossbow Through the AK-47.McFarland. p. 14.ISBN978-1476666662.
- ^abWerner Soedel, Vernard Foley (March 1979)."Ancient Catapults".Scientific American.240(3): 124–125.Bibcode:1979SciAm.240c.150S.doi:10.1038/scientificamerican0379-150.Archivedfrom the original on 2019-05-20.
- ^Alan Wilkins (2003).Roman Artillery.Osprey Publishing. p. 8.ISBN978-0-7478-0575-5.[permanent dead link]
- ^Needham 1994,p. 172-173.
- ^Philo of Byzantium, "Belopoeica", 73.34
- ^πολυβόλος,Henry George Liddell, Robert Scott,A Greek-English Lexicon,on Perseus Digital Library
- ^πολύς, Henry George Liddell, Robert Scott,A Greek-English Lexicon,on Perseus Digital Library
- ^βάλλω,Henry George Liddell, Robert Scott,A Greek-English Lexicon,on Perseus Digital Library
- ^Episode 152: Arrow Machine Gun.mythresults, November 3, 2010.
Bibliography
[edit]- Needham, Joseph (1994),Science and Civilization in China Volume 5 Part 6,Cambridge University Press
External links
[edit]![](https://upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/30px-Commons-logo.svg.png)
- The Repeating Catapult of Dionysius
- Reconstructed Polybolos in actionArchived2013-12-02 at theWayback Machine(clip)