Hydrometer
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“Determines the specific gravity of any given liquid. A hollow ball, C, rises to a graduated scale while the solid ball, B, keeps C vertically positioned.” —Quackenbos 1859
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Chemistry ApparatusSource
G. P. Quackenbos A.M. A Natural Philosophy: Embracing the Most Recent Discoveries in the Various Branches of Physics, and Exhibiting the Application of Scientific Principles in Every-day Life (New York: D. Appleton and Company, 1859) 142
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