Glass and Mercury Antique Hydrometer in Original Wooden Box linen pillowcases unexpected surprise

unexpected surprise

painted on panel as well as its surrounding frame

Widely collected by museums

perfect for one pretty bloom

Glass and Mercury Antique Hydrometer in Original Wooden Box linen pillowcases unexpected surpriseAt first I thought this antique Griebel Instrument Co. hydrometer was an old thermometer, until I noted that the numbers on the side run 0 to 6 rather than showing temperatures. Ive since learned that a hydrometer is used for measuring the relative density of liquids based on buoyancy: you pour liquid into a container, lower the hydrometer into it until it floats, and then the point at which the surface of the liquid touches the stem of the hydrometer