How to detect an inductor's back EMF?

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"The 2.2μF capacitor resonated with the coil inductance..."

Yes. The ensuing 'chirp' of a pulse-train was essential for cleaning a cylinder's spark-plug's oft-oily gap and getting efficient, thorough ignition of chamber mix.

( IIRC, this concept was later re-invented as 'multi-spark', albeit electronically... )

Making sure all of a baulky engine's coil, distributor and plug leads were functional and securely connected was but half the battle. The C's innocent appearing 'silver' cylinder only took moments to swap, but its invisible failure would stymie operation...
 
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