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The Crossbow   >  Chapter 57    >   Ballista   >  Construction   > p.301

Table of Contents List of Illustrations Index Appendix

Chapter LVII

The Ballista, Its Construction and Management

The ballista projected heavy arrows of a size proportionate to its power and not stones, though it was frequently alluded to by ancient and mediaeval writers as a stone-throwing engine.

This mistake arose from the fact that the names balista and catapult were often used indiscriminately in accounts of battles and sieges.

The projectile force of the ballista, as in the catapult, was obtained from tightly twisted cordage formed of horse-hair or of the sinews from the necks of large animals, such as horses and oxen.1

The construction of the ballista resembled two catapults with their arms connected by a thick rope, this rope forming the bow-string of the engine. In appearance the balista was like an immense crossbow, and it doubtless suggested the invention of the crossbow or manubalista carried by the mediaeval soldier.

The marked difference between the balista and the crossbow was, that the bow of the ballista consisted of two pieces or arms, - each arm being worked by its separate skein of twisted cord, - while the bow of the crossbow was always made in one length.

In the balista, each arm of its bow worked independently. In the crossbow, the arms of the bow acted, of course, as one piece.

The catch which secured the stretched bow-string of the military crossbow was similar to the catch that held the string of the ballista ; the lock of the crossbow, as regards its tumbler and long trigger, being closely copied from that of the balista.

The windlass which pulled back the bow-string of the balista was probably the original of the small windlass used for the thick steel bow of the fifteenth century crossbow.

Though mediaeval authors sometimes write of this engine as if it had a gigantic bow in one piece, I can find no evidence that such a bow was fitted to the ballista.

1 See footnote, p. 64.


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Inspired by the great war machines and siege catapults of Leonardo da Vinci , this all Red Oak hardwood trebuchet features an open counterweight cabinet for range and trajectory adjustment. 

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