Re: Addendum-DC Tesla

Sure it's rectification due to dissimilar electrodes.  You can
charge a capacitor with DC from a spark coil if you use such
electodes, for example a disk and a needle, and play with spark
length.  I think that's why you get the "jolts" off the TC.  When
the fatter and continuous sparks occur I think there's enough 
ionization present to nullify any significant rectification.  I
get plenty jolts even off my little coil run from 12 V ignition
Ed Phillips