September 24, 2008
http://netapps.marshall.edu/lego/lessonplans/Turnstile/Turnstile.html
The class is studying gears by doing a turnstile project and changing it into a wind speed indicator.
pawl (pôl) n.
A hinged or pivoted device adapted to fit into a notch of a ratchet wheel
to impart forward motion or prevent backward motion.
[Probably from Dutch pal, from Latin palus, stake]
They followed the worksheet on turnstiles.
Then made them into anemometers.
