A Foucault pendulum is used to demonstrate the rotation of the Earth. In the above photo, we see the Foucault pendulum at the Natural Science Center in Greensboro. The Paris Observatory displayed the first one publicly in 1851. Perhaps the most famous Foucault pendulum is the one in the Pantheon in Paris, named after the French physicist who conceived the experiment. Wikipedia has a complete list of Foucault pendulums in the world categorized by country and by state for the USA. From this list, we learned that Greensboro actually has two: one at the Natural Science Center and one at NCA&T University. There are four total in North Carolina, one in nearby Winston-Salem and another in Fayetteville. According to the Wikipedia list, 39/50 US states boast at least one pendulum.
This is our contribution to Monochrome Weekly. The monochrome theme recently celebrated its first anniversary.