Well handle at Carlisle Castle

On this well handle, the length of the handle is 4x the radius of the drum around which the chain is wrapped. This means that the effort will be a quarter of the load. The density of water is 1 gram per cubic centimetre so a litre of water has a mass of 1kg and a weight of 10N. I might be able to lift 10kg so that I could pull 40kg of water up from the well.