polybolos

The polybolos was an ancient Greek repeating ballista, reputedly invented by Dionysius of Alexandria and used in antiquity. The polybolos was not a crossbow since it used a torsion mechanism, drawing its power from twisted sinew-bundles. However the earlier and similar oxybeles employed a tension crosbow mechanism, before it was abandoned in favor of torsion.

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torsion siege engine, 

cat, chelone, mangonel, sambuca, siege tower, springald, torsion siege engine, 

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Reconstructions of ancient mechanical artillery in the Saalburg Museum in Hesse, Germany.

Reconstructions of ancient mechanical artillery in the Saalburg Museum in Hesse, Germany.

Polybolos

Type	Subtype	Date	Description	Notes	Source
commons	image		Reconstructions of ancient mechanical artillery in the Saalburg Museum in Hesse, Germany.		Commons
commons	image		Reconstructions of ancient mechanical artillery in the Saalburg Museum in Hesse, Germany.		Commons
commons	image		Polybolos		Commons