Here are two Korean videos about a Korean ballista and a Korean Hwacha.

http://www.youtube.com/watch?v=Os74S43EY6Q

http://www.youtube.com/watch?v=86Nv1Yz9x1g...ted&search=

The Korean ballista looks very similar to the Chinese ZhuangZiNu. And when I say similar, I meant I can't tell the difference.

Anyway, notice how the ballista was hit with a hammer in order for it to be released(wonder how that worked, considering the guy didn't really "hit" the trigger as much as "tap" it, so why is he even using a hammer?). This may explain the Jin battle in which troops reportedly "slammed" the crossbows in order to stop a cavalry charge. That always puzzled me.

http://www.youtube.com/watch?v=jolYDinb_50...ted&search=

Another one, though now it has nothing to do with China, but it's still a cool machine though. I think there's a typo when they said the ball it shot weights 750kg(no way a person can lift something that heavy, nor can something weight more than 1500 pounds and be the size of grass). The ball's still impressively heavy though, look at how deep it went! The trigger, like the Korean one, seems to be designed more for the experimenter's safty(meaning it's not as heavy/effective as it should be) rather than for maximum poundage.

Just one question with the first link, they called it 'Shin Gi Jun', is that translated as 神機槍 in chinese? because i remember reading from some old chinese ming dynasty manual ages ago on the internet and it has that word.

best regards,
Intem

The first video is a Chinese triple crossbow, a seige engine. (the youtube uploader probably got it wrong, cuz I don't think the Koreans used it)
The 2nd one is based off of the Chinese multiplatform fire arrow launcher.


Both of these weapons were featured on the history channel episode:
"Ancient Discoveries: Chinese Warfare"