Set of two of Bone Sliderules
A fine pair of bone sliderules for use in the distilling and brewing industry to work out the alcohol content of different alcoholic drinks from their specific gravity.
Please note that that these are not two individual sliderules but are a set.
Size about7" (I regret I forgot to measure them and they are not by me as I write this piece).
Date circa 1880.Price includes carriage.
see also Spirit Bubbles (hydrometer) on this web site
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