experiment / prototype / rehearsal
materials: diverse materials
Two metal rods are connected in series with an electromagnet and a direct current power supply. When they touch, the circuit is completed to engage the electromagnet, whose magnetic field forces the rods apart. The circuit is broken and the spring-like rods relax, make contact again and so on. The circuit oscillates. The electrical sparks emitted can also be heard as static pops and clicks on a nearby AM radio tuned between stations.