Editing Anemometer (section)

===Ping-pong ball anemometers===
A common anemometer for basic use is constructed from a [[ping-pong ball]] attached to a string. When the wind blows horizontally, it presses on and moves the ball; because ping-pong balls are very lightweight, they move easily in light winds. Measuring the angle between the string-ball apparatus and the vertical gives an estimate of the wind speed.

This type of anemometer is mostly used for middle-school level instruction, which most students make on their own, but a similar device was also flown on the [[Phoenix Mars Lander#Meteorological station|Phoenix Mars Lander]].<ref>[http://marslab.au.dk/research/instrument-development/the-telltale-project/ "The Telltale project."] {{webarchive |url=https://web.archive.org/web/20120220080017/http://www.marslab.dk/TelltaleProject.html |date=20 February 2012 }}</ref>