I was screwing around with youtube and found something that people here may like. A video of a Chinese Repeating Crossbow.

http://www.youtube.com/watch?v=UYgbKi4SX5M

Thanks Anthrophobia for the video!

I wonder if the crossbow maker has been to LJM's Making the Chu-Ko-Nu (Zhuge Nu), The famous 'machine-gun crossbow' thread? If not, I bet he would fit in well here

I was about to say! It looks suspiciously similar.

The poster of the video was asked where he got the information, and he said it was under his profile favourites.
Its the history channel, and there is a guy firing one and explaining it after handling an example at the Beijing Military museum.
http://www.youtube.com/watch?v=dwpWU9QbRR4 [EDIT: link no longer works. Madalibi - 2008/9/18.]
The items firing power was very low even if it does stick into a cardboard target (being hand drawn with ease it is by definition a very low draw-weight and poison was allegedly added to increase lethality)
A good short film on the repeating crossbow.

The museum modern example he calls '3rd century' but it seems the crossbow of this design is much later, as the earlier reference is literally refering to a multi bolt crossbow & not a repeater (as posted on CHF before).
On that link the narrator also stands in front of a huge bed crossbow (probably Song? these devices are well known compared to East Zhou devices).

That ending stock of the ChoKoNu reminds me of that of the Greek belly bow. No surprise considering that both uses the stomach as a place to support the stock, although for different reasons(The Chinese used it to shoot the bolts, while the Greeks used it to draw the string).