You can also use our lost breweries map as a source of where to find some. I know I'll be taking photos when I'm in the southwest next week (at least the old Deasy's brewery in Clonakilty).
I came across this 1936 newspaper article detailing a fatal workplace article at the old Cairnes Brewery in Drogheda. Looks like the fundamentals of brewing haven't changed much. Hope the link works out.