50mm Spark Induction Coil, 11.5 x 7 x 6" Rod Material_Stainless Steel generating enough output when cranked

generating enough output when cranked to light a connected bulb during electromagnetic-induction and energy-conversion demonstrations

Compares 2-

Long-focal double-concave glass lens at 75mm diameter and 300mm focal length

landing it back in the same barrel as the car rolls forward

this thermistor mounts on a transparent base with 4mm color-coded sockets and a printed circuit diagram for sensor-circuit student work

50mm Spark Induction Coil, 11.5 x 7 x 6" Rod Material_Stainless Steel generating enough output when crankedBuilt on a step up transformer with an electromagnetic shaker pulsing the primary winding, this coil draws tens of thousands of volts from a 9 12V DC source to strike 50mm sparks.