SiJiao Pao "four footed" Catapult, Chinese Tang Dynasty 9th century AD

"Chinese Siege Warfare: Mechanical Artillery & Siege Weapons of Antiquity" archive copy at the Wayback Machine by Liang Jieming, ISBN 981-05-5380-3

http://authors.history-forum.com/liang_jieming/chinesesiegewarfare/images/fft-t1.jpg^{[dead link]}

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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>