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Sparks also jump easiest from a sharp edge or point and not from a rounded nub, that is why NGK V-power plugs seem to work well, the center contact has a simple v grove creating two points for sparks to jump, of course the sharp edge of a standard post works well too, splitting the electrodes is not a new idea.
If you really want to get in deep, the SAE published a book a while back on spark plugs and spark plug design and explained a lot of the ideas behind some of the different designs along with their draw backs.
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