Hydrometer, Burnett (possibly), c. 1800 - c. 1858 Canvas Print
Moisture weigher for determining the specific gravity of liquids, consisting of a float in a glass with sawdust and cotton. The float consists of a glass body weighted with a mercury ball at the bottom, which is sealed with lacquer; in the thin upper end is a rolled-up paper shell, ranging from 5 to 20, with a W at the top.
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