100mm Spark Induction Coil with Adjustable Vibrator Science at Home_Elementary Science sized so that students can

sized so that students can charge an outer pail and watch the inner pails register zero charge during the classic ice-pail demonstration

1 Henry air-core inductor on a bobbin with 4mm sockets

chloroplasts

spanning cell voltages up through high-tension supply outputs

Double-concave glass lens at 3-inch diameter and 200mm diverging focal length

100mm Spark Induction Coil with Adjustable Vibrator Science at Home_Elementary Science sized so that students canLarger spark 100mm induction coil from a 6 12V DC input with adjustable vibrator and base mounted suppression capacitors, supplied with two 5 inch insulated handle pointer electrodes.