The IEC Spark Generator is used with Linear Air Tracks where measurement is to be performed by 'Spark Recording' rather than Photo Gates. For Spark Recording, a metal electrode fixed to 2x gliders causes a spark to jump the small gaps from a long metal track on one side of the Air Track to a strip of paper tape on the other side. The Spark Generator is the source of the 2x sets of sparks which can be very accurately adjusted in rate from 2.5 through to 50 per second. A pair of high voltage cables joins the instrument to the spark tracks.
The paper tape will have black dots representing each spark so that velocity and accelerations can be calculated.

With Instruction Sheet.