Hydrometer Diagram - Historical Scientific Instrument for Density Measurement #65961 (License: Personal Use)

This 19th-century line drawing depicts a hydrometer-a calibrated float used to measure the specific gravity or density of liquids-submerged in a tall glass cylinder. The instrument features a weighted bulb at the bottom for stability and a narrow stem marked with a scale (A), while the liquid level aligns with a reference mark (B). Such diagrams were common in physics and chemistry textbooks to explain Archimedes’ principle in practical applications.

Used in educational content about fluid mechanics, historical scientific instruments, or brewing/wine-making guides; targets students, educators, and hobbyists seeking foundational knowledge of density measurement tools.