PIRA Classification: 5J20.20
Description: A 40 W bulb is placed in series with a 90 V battery and a 20 H inductor. A 15 W bulb is placed across the inductor. When the knife switch is closed, the 15 W bulb flashes momentarily, then dims. A short time later, the 40 W bulb lights. When the switch is opened, the 15 W bulb will flash due to the collapse of the field.
Special Instructions: None
Condition: Good
Setup time: 2 minutes