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  I1: Jacob's Ladder, Resistance
      nails, Copper and
      aluminum tubes, Resistor
      boxes, Large resistors,
      Batteries, Circuit parts











  I2: Caste iron capacitor
      plates, Lightweight
      capacitor plates, Attracting
      capacitor plates, RC circuit,
      Adjustable capacitors,
      Series capacitors








  I3: Galvenometers,
      Voltmeters, Ammeters,
      Multimeters






  I4: Solenoids, Transistors