How an Anemometer Measures Wind Speed - Historical Diagram Explained #10004 (License: Personal Use)

This historical diagram depicts a U-tube anemometer, a mechanical instrument that measures wind speed by observing the displacement of liquid (often water or mercury) in a sealed U-shaped tube. One arm (B) is exposed to wind pressure while the other (C) remains shielded; the resulting height difference between the two columns corresponds to wind velocity via Bernoulli’s principle. Such devices were foundational in early meteorological studies before electronic sensors became widespread.

Used in educational content about meteorological instruments, historical science pages, or museum digital exhibits. Matches user intent seeking visual explanations of vintage weather measurement tools or physics principles in action.