====== Anemometer Lesson Outline ======
The original version of this page is from a document Grace and Ned made to get a grasp on what we'd be asking TTI students to do in their first lesson.
===== Chronologically =====
  - Make the anemometer. (This will probably need a lot of pictures to explain it)
  - Get it moving (either on the back of a bike, or with wind, not by blowing on it)
    * Record the most common voltage and the highest one on the website/printout.
  - Come back inside: a timekeeper should let everyone know when a minute is up while everyone else tries to make the most common voltage they saw outside and counts revolutions.
  - Do the same thing but try and make half the voltage.
  - Everyone divides the voltage of each trial by the RPM. The numbers should be similar; if they’re not, then try making the same two voltages again.
  - That number? It’s k_V! Calculate what RPM you’ll get to make some voltage near what you’ve already tested.
  - So what rpm was it moving at the highest Voltage you measured?
  - Now a geometry problem: given that what’s important is the center of the cup, you know the size of the racetrack; the previously computed RPM is how many laps it does per minute. So how fast is the ‘racer’ moving?
  - That’s the wind speed (this could use a convincing illustration, I think).
  - Finally, measure the speed at which you can pedal a bike, or the wind speed around your house.

===== Illustration Ideas =====
==== making the anemometer ====
  * brief illustration of “catching the wind”: very simple pic of an anemometer moving as the wind pushes it. Should show crossbar, short shaft, motor, and very simple cups.
  * focus in on the cups - they have to catch the wind, they have to all be in the same direction. Again, very simple drawing of anemometer. Perhaps use arrows to show directions of cups.
  * Draw a few examples of “things that could be cups” or even “shapes that could be cups”
  * Drawing for construction suggestions - how shaft should fit onto motor (glue? pin? etc). All shaft/cups/motor should move at once.

====testing the anemometer====
  * picture of anemometer hooked up to voltmeter
  * picture of testing on bike 
  * picture of testing in wind

====timekeeper testing====
  * picture of the exercise - one dude keeping time, others turning, looking at voltage
  * possibly with a “counting spiral” for counting revolutions

====working out wind speed====
  * Racetrack analogy illustration.Compare dude on a racetrack (SEE HIM RUN IN A CIRCLE) with cup on anemometer (SEE IT MOVE IN A CIRCLE).
  * Happy limb figures measuring wind in general