Inertia Demonstration Kit Material_Bristle Hard vulcanized ebonite rod that

Hard vulcanized ebonite rod that takes on a strong negative charge when rubbed with fur

and polished — letting an infrared sensor compare emissivity at boiling-water temperature

this concave glass mirror at 100mm focal length runs at f/1 for vivid real-image demos and converging-reflection work

Twelve-position rotary capacitance substitution box selecting one capacitor at a time

and HVAC work

Inertia Demonstration Kit Material_Bristle Hard vulcanized ebonite rod thatDemonstrates Newton's first law by yanking a metal card from beneath a steel ball, leaving inertia to drop the ball straight into the waiting receptacle below.