[Amps] conductivity problem

[CLIVE COLLINS]

Good day Gentlemen,
I am constructing a device that will permit the continuous rotation of a shaft which will have a circuit on one end that will require power at 230 volts ac.
I do not want to use conventional carbon brushes and slip rings and I have elected to go down the mercury annulus ring connections which will obviate the brush wear and need for replacement in a location it will be difficult to access.
My question is how do I calculate the current conductivity of the mercury to pass possibly ten amperes.  This calculation will have to take into account the ring "bath" of the liquid and the size of the electrodes that will pick up the current.
Additionally, does anyone have any information on the possible corrosion effects between mercury and other metals that I should steer clear of bearing in mind the electrodes to be used for picking up the power.
I am aware of the amalgam action of mercury with certain other metals but is there any sort of corrosive attack that might take place.
Thanks in advance for any answers and if it preserves the bandwidth of the reflector then I will look forward to your advice direct.
Regards,
Clive GW3WEQ