Excise Officer's slide-rule, boxwood, 12" long; with four sliders Inscribed under one of the sliders: "Edwd Roberts Maker in Dove Court Old Jewry, London". Excise slide rules were used from the late 17th century to calculate the volume of liquor in barrels.The barrels came in different forms and the size of the gallon varied for different fluids. The calculations were quite complicated.
- Object Number:
Closed: 23 mm x 315 mm x 26 mm, 0.02 kg
Extended: 23 mm x 590 mm x 26 mm, 0.02 kg
- Mr H.M. Wickers
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