Onager

The onager was a Roman torsion-powered siege engine. It is commonly depicted as a catapult with a bowl, bucket, or sling at the end of its throwing arm. The onager was first mentioned in 353 AD by Ammianus Marcellinus, who described onagers as the same as a scorpion. The onager is often confused with the later mangonel, a "traction trebuchet" that replaced torsion powered siege engines in the 6th century AD.

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catapult, mangonel, polybolos, sambuca, springald, torsion siege engine, 

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Frameless

Catapulta by Edward Poynter (cropped, 4to3)

Sketch of an onager, a type of torsion siege engine

Onager de Reffye

00-machines-of-war-catapult-1708x900

The Catapult (1868). Oil on canvas, 155.5 x 183.8 cm (61.2 x 72.3 in). Laing Art Gallery, Newcastle upon Tyne

Catapulta by Edward Poynter (cropped, 4to3)

Sketch of an onager, a type of torsion siege engine

Onager de Reffye

00-machines-of-war-catapult-1708x900

The Catapult (1868). Oil on canvas, 155.5 x 183.8 cm (61.2 x 72.3 in). Laing Art Gallery, Newcastle upon Tyne

• Mechanics of the onager - scientific article published in 1986, Q1860

Type	Subtype	Date	Description	Notes	Source
commons	image		Catapulta by Edward Poynter (cropped, 4to3)		Commons
commons	image		Sketch of an onager, a type of torsion siege engine		Commons
commons	image		Onager de Reffye		Commons
commons	image		00-machines-of-war-catapult-1708x900		Commons
commons	image		The Catapult (1868). Oil on canvas, 155.5 x 183.8 cm (61.2 x 72.3 in). Laing Art Gallery, Newcastle upon Tyne		Commons
commons	image		Catapulta by Edward Poynter (cropped, 4to3)		Commons
commons	image		Sketch of an onager, a type of torsion siege engine		Commons
commons	image		Onager de Reffye		Commons
commons	image		00-machines-of-war-catapult-1708x900		Commons
commons	image		The Catapult (1868). Oil on canvas, 155.5 x 183.8 cm (61.2 x 72.3 in). Laing Art Gallery, Newcastle upon Tyne		Commons