Museo Galileo
Virtual Museum
Anemometer / Anemoscope
Anemometer / Anemoscope

Instrument for measuring wind velocity. There are a variety of types. The simplest and most common are (1) models that determine wind velocity from the inclination it imparts to a plumb line, and (2) blade models, which calculate velocity from the number of revolutions completed in a given time by a pivoting wheel fitted with blades or small cups.