Bick, OMMMW pt.4, p.59, reproduced a photo of the Nant Iago Lead Mine pumping and winding water wheel signal board:
1 - stop
2 - lower [short illegible word]
3 - haul up
4 - more water on wheel
5 - start pumpinmg engine
6 - stop pumping engine
7 - men on the rope
8 - less water on wheel
9 - sick or wounded
10 - accident
[no code for 11]
12 - top pole lost water