A lovely 18th c. gauging slide rule

The art of Gauging and Ullaging,  i.e. assessing the quantity of  liquor, beer or malt in a barrel in order to tax it properly, used to be an important application of mathematics, and resulted in the development of some intricate computing devices over the last few centuries.

E. Roberts Everard-style Gauging SlideruleCheck the new article on my History of Computing site to see a lovely Everard-style gauging slide rule dating back to the 18th century, and learn how to apply it in case you ever need to ullage a cask of ale!

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