Demos by PIRA

  2C20.10Venturi meter: Manometer tubes on tapered wind tunnel tube.
  2C20.15Glass standpipes with a constriction. Similar to C+25+10.
  2C20.20Glass aspirator: Compressed air draws colored water up glass tube.
  2C20.30Bernoulli's principle: Ball suspended in air stream.
  2C20.35Compressed air through funnel sucks in ball.
  2C20.53Two roof models, hinged, placed in wind stream.
  2C20.80Flettner rotorcar blown with fan.