Tom Tishken KD4WOV said
One other note I just thought of. Here in the US displays for Tesla coils
must be in a shielded an environment, i.e. no radiation or EMI released
the shielded enclosure. not sure if that was the case there or not.
The smaller coils were demonstated in a darkened back room of the
electricity hall, which is a metal building. The largest of these produced
sparks about 12in (300mm) long. The large coils were used outside and fired
up just as it was getting dark. All afternoon the site for this test was
prepared by digging ditches for a cruciform shaped copper ground structure.
These coils could produced sparks up to 6 to 8ft long. In fact there were
sparks (more like lightning) everywhere.
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