Hydrometer Diagram - Historical Instrument for Measuring Liquid Density #215192 (License: Personal Use)

This black-and-white technical illustration shows a longitudinal cross-section of a traditional glass hydrometer, highlighting its conical bulb, sealed weighted base, and graduated stem with an internal float assembly. The hatched shading indicates solid components, while the open section reveals the air chamber and calibration markings used to determine liquid density via buoyant displacement. Such instruments were vital in 19th- and early 20th-century laboratories, breweries, and distilleries.

Used on educational or historical science pages explaining density measurement tools; targets users researching antique scientific instruments, brewing equipment, or physics principles like Archimedes’ principle.