U-Tube Manometer Diagram - Fluid Pressure Measurement Principle #3558642 (License: Personal Use)

This black-and-white line drawing depicts a U-shaped glass tube partially filled with liquid (indicated by horizontal hatching), with one side open and the other connected to a pressure source via a valve mechanism at the base. The liquid levels in both arms are shown equal, indicating atmospheric pressure equilibrium; any pressure differential would cause a measurable height difference. The design reflects early 19th-century scientific instrumentation used in pneumatics and hydrostatics.

Commonly used in educational materials on fluid mechanics, physics textbooks, or historical instrument archives to explain pressure measurement principles. Matches user intent for learning basic manometry or understanding vintage lab equipment.