It was last used when whisky was measured in hogsheads and production of the water of life was moving from an often-illicit farmyard enterprise to a thriving national business.Now the secrets of whisky production from 200 years ago are being uncovered by archaeologists probing the remains of a distillery which ceased production in 1824.Fire pits which would once have heated copper stills, tasting glasses, bottles and the timber-lined vats which held gallons of the amber nectar have all been unearthed at the National Trust dig on the old site of the Glenlivet distillery.During the past two weeks the archaeology team...