Jim is right. When the points open , the field collapses which produces a wattage in the coil primary which tries to arc at the points. The condenser absorbs that charge to keep the points from burning. The voltage coming out of the coil is many times what is going in to it. This voltage in the primary acually bounces back and forth between the condenser and coil. What we see is a spark, but it is many , many sparks so close together that it looks like only one. They say it makes the coil ring. The spark is coming from the secondary windings which are picking it up from the moving field. Clear as mud?
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Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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