There isn't much information specifically, on the cannons of Rotherham on the web.
Here are a few,with other links on the georgian navy.
Rotherham web about the walker family
Rotherham cannons on HMS Victory website
Recreation of a victory broadside on you tube excellent!
Rotherham District civic Society
mention of the walker boring mill at burcroft conisborough
Another brief mention of the walker cannons
Interesting video about French cannons being used as bollards in London. (and the women is gorgeous)
More about the Napoleonic Cannons used as bollards in the East end of London.
James close and his naval cannon collection.Some interesting pieces of information.
Unofficial rotherham Excellent site about Rotherham and its History