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JAMES MELCHER: Edgerton's Boomer illustrates the induction of a current in a conductor subjected to a time-varying magnetic field and the associated magnetic forces. It illustrates the interplay between the laws of Faraday, Ampere, and Ohm that determines the distribution, duration, and magnitude of currents in conductors under magnetoquasistatic conditions. This is the coil. The winding wire circulates like so and is connected to the capacitors in this cabinet by these leads. When the high-voltage power supply in the cabinet is turned on, the capacitor is charged to 4 kilovolts. The switch then connects the capacitor to the coil. It's closed when this button is pushed. The switch consists of a spark gap, which we just heard. We can see it if we open this panel. The switch is closed by a spark across this gap. That spark is activated by applying a voltage to this electrode to make a smaller electrical breakdown in the gap. Just once, we'll bypassed the safety ...

PROFESSOR: Edgerton's Boomer illustrates the induction of a current in a conductor, subjected to a time-varying magnetic field and the associated magnetic forces. It illustrates the interplay between the laws of Faraday, ampere and ohm that determines the distribution, duration, and magnitude of currents in conductors under magneto quasi static conditions. This is the coil. The winding wire circulates like so and is connected to the capacitors in this cabinet by these leads. When the high-voltage power supply in the cabinet is turned on-- [MOTOR STARTS] --the capacitor is charged to 4 kilovolts. The switch then connects the capacitor to the coil. It's closed when this button is pushed. [BUTTON CLICKS] The switch consists of a spark gap, which we just heard. We can see it if we open this panel. The switch is closed by a spark across this gap. That spark is activated by applying a voltage to this electrode to make a smaller electrical breakdown in the gap. Just once...