Picture of Qin Dynasty Arcuballista Bolts shown with Regular Handheld Crossbow Bolts, 5th- 3rd century B.C.

Source

"Chinese Siege Warfare: Mechanical Artillery & Siege Weapons of Antiquity" by Liang Jieming, ISBN 981-05-5380-3

http://authors.history-forum.com/liang_jieming/chinesesiegewarfare/images/qinacruballistabolts.jpg

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https://creativecommons.org/licenses/by/1.0CC BY 1.0 Creative Commons Attribution 1.0 truetrue

The photographs are part of my book. You're welcome to use them on Wikipedia so long as you list my book "Chinese Siege Warfare: Mechanical Artillery & Siege Weapons of Antiquity" by Liang Jieming (ISBN 981-05-5380-3) as the source.

I hope that helps.

Cheers, Leong Kit Meng (Liang Jieming) <liang_jieming@history-forum.com>