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English: Illustration of a Hinged Counterweight Trebuchet Prepped for Transit from the Wujing Zongyao, late Ming (Wanli Period) edition.
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 (ISBN981-05-5380-3) as the source.
This is a faithful photographic reproduction of a two-dimensional, public domain work of art. The work of art itself is in the public domain for the following reason:
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Illustration of a Hinged Counterweight Trebuchet Prepped for Transit from the Wujing Zongyao, late Ming (Wanli Period) edition ==Source== [http://authors.history-forum.com/liang_jieming/chinesesiegewarfare/ "Chinese Siege Warfare: Mechanical Artillery &