Copper and Iron Compound Bar for Thermal Expansion Material_Glass Hard vulcanized ebonite rod that

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

Designed to make electric field lines visible

running on cone bearings in a cord-ready metal frame for friction

Demonstrates electromagnetic induction and Faraday's law by stepping DC input into 25mm high-voltage sparks across adjustable electrode rods on an open chassis

Glass-tube-housed NTC thermistor at 4

Copper and Iron Compound Bar for Thermal Expansion Material_Glass Hard vulcanized ebonite rod thatRiveted compound bar of copper and iron strips at 200 by 15mm, flexing under heat as each metal expands at a different rate, the working principle behind bimetallic thermostats.