Anemometer 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 Phoenix Mars Lander. The first designs of anemometers that measure the pressure were divided into plate and tube classes. These are the
What Kate Does reviews"; however, this was down significantly from the previous episode's 89 and Bonnie Covel of About.com noted that " 'What Kate Does' brought us a bit of negativity. In general, fans just didn't like the episode". "What Kate Does" was largely considered to be a step down from the season premiere in pacing, revelations and writing; Mike Hale of "The New York Times" described the episode as "contemplative", "anticlimactic" and "subdued" and the flash sideways as "kind of boring and seemingly pointless." Chris Carabott of IGN, who gave the episode a score of 7.3 summed up that " 'What Kate