Demos by PIRA

  4B40.10Light the Match.
  4B40.11Concave mirrors focus candle flame on thermopile across bench.
  4B40.11Concave mirrors and horn thermopile senses candle across room.
  4B40.14Archimedes' principle: Aluminum and brass cylinders.
  4B40.40Computer demo: Kirchhoff's radiation law, runs 15 min.