Safety Gaps at high power (pole transformers)

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Original poster: "kd4lyh by way of Terry Fritz <twftesla-at-uswest-dot-net>" <kd4lyh-at-email.msn-dot-com>

Awhile back there where some postings on this subject. My question is (which I
should already know) . Is there a brass center ball electrode between each of
these safety gaps going to rf gnd. or just a plain gap consisting of two brass
electrodes. One set for the pole transformer and one set for the primary tank
cap.
Regards to all Jeff