Here you can see the complete rotary spark gap with the cooling oil chambers. The brown box behind the red hoses is where 5 gallons of transformer oil is chilled with a pop machine chiller. Oil is pumped into the first white chamber (almost hidden behind the aluminum cooling chambers) which has 8 hoses connected to the base of the 8 aluminum cooling chambers. The oil then travels through the aluminum chambers out the top to the second white chamber where it is combined and returned to the chiller box. The copper pipe and strap in front of the spark gap is the ground for the primary and the secondary. The heavy black cable with copper end laying out this way is where the long white capacitor connection transfers the power to the spark gap. I am using 1/4" diameter tungsten rods 2" long in this rotary spark gap it is capable of holding 1/2" diameter tungsten rods 2" long. The rods are starting to melt so I will probably go to a larger rod once the capacitors hold the power. These 1/4" rods are supposed to hold 300-500 amps. So you can see, there is a lot of power and heat even with the rods being cooled with 60-90 degree oil. Note, I am putting in 12,000 volts at 1-1/2 amps, but at the Tesla Coils base the voltage and amperage has risen dramatically due to oscillations of the coil. The better the coil is tuned the higher the oscillations, the higher the power output.