Angular Momentum (A+30)

  A+30+0 Minor's apparatus: Movable discs rotated by falling weight.
  A+30+5 Maxwell's wheel: Flywheel with axle, supported on strings or stand.
  A+30+10 Rotational inertia device: Sliding weights on rotating rod.
  A+30+15 Rotating chair with dumbbells or weighted bicycle wheel.
  A+30+20 Maxwell's top, has adjustable center of gravity.
  A+30+25 Large conical aluminum top.
  A+30+30 Gyroscopes; various.
  A+30+35 Sire's Polytrope.
  A+30+40 Film: "Conservation laws in zero G", sound, 14 min..
  A+30+45 Large gyroscope in a suitcase.
  A+30+50 Rotating Platform for Outreach
  A+30+55 Falling Coffee Cup is Arrested by Friction
  A+30+60 Spinning Bicycle Wheel Stays Upright.