I'll not drag it out then

These are two of the three rock cannon at pont y pair in Betws-y-coed, North Wales.
A rock cannon is a series of shallow bores joined by a groove carved into the rock. The bores were filled with black powder, topped with crushed slate, and fused with a feather quill filled with powder. Powder was then poured into the groove between the bores, and lit.
The powder in the groove would burn and set off each of the bores in turn, sounding like cannons going off. It was used to celebrate weddings and significant occasions, more recently for the investiture of the Prince of Wales.
The first photo shows a more modern smaller cannon, but the second and third pics show an original 53 hole cannon. At first you can't quite see it, but then it suddenly stands out.
I've never heard of this before, but it fascinated me, what a great idea, must have been great fun
