The primary is resonant tank circuit working on frequency 1
The secondary is resonant tank circuit working on frequency 2
The secondary contains also antenna and because of that there is also 3 resonant frequency for longitudinal 1/4 wavelength so the secondary is efficient radio transmitter.
You spark primary tank circuit not frequently, but it oscillate freely, secondary oscillate on some harmonics and the resonant LC and the length of antenna is correlated (L= 1/4 wavelength). Antenna instead of transmitting radio around is matched to the output part so all energy from ambient is stored in capacitors.
I do not pretend it works but the essence is something like above.
The secondary is resonant tank circuit working on frequency 2
The secondary contains also antenna and because of that there is also 3 resonant frequency for longitudinal 1/4 wavelength so the secondary is efficient radio transmitter.
You spark primary tank circuit not frequently, but it oscillate freely, secondary oscillate on some harmonics and the resonant LC and the length of antenna is correlated (L= 1/4 wavelength). Antenna instead of transmitting radio around is matched to the output part so all energy from ambient is stored in capacitors.
I do not pretend it works but the essence is something like above.
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