This is what they used to make.........
"It was in the Grinding Hull that edge tools were sharpened to a fine cutting edge. The Hull was built in 1817, and originally housed 6 grindstones and 2 glazing stones, all powered by a waterwheel. The stones were 6 feet in diameter when new, and hung in a trough filled with water to keep the stone wet when grinding. The grinder sat astride a wooden horsing over the stone, and held the blade against the stone as it spun round." (from the museum's website)
A trip to Abbeydale Industrial Hamlet in Sheffield - a place I've planned to go for years.