"The spring-frame was designed to hold the two torsion-springs under extreme tension. The syrinx (body of the weapon) fitted into the gap between the two springs, forming a window (dioptra) up above, through which the gunner could take his aim." (Authors drawing)
Reference:
D.B. Campbell, "Greek and Roman Artillery, 399BC -- AD363," Osprey Publications, New Vanguard, 89, UK, 2003
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