Here is a quick test trying to crack an Alumitone pupThe coil runs to the screw and an atracting magnet not conectedbottom left. The magnetic field must go up and over to the second magnet. This only works when the left yellow earth wire is connected to ground and the aluminium. The coil has two conections to the jack socket.I think they also use a current system,with some kind of stepo up device, as this one might give interference, but kind a proves the idea.Aluminium is keen to give up its electrons, so must help this whole electrical field flow.I have also done some tests tonight with telephone coils and what came clear was as you ran over a fret it gets louder, so the earth field is a key to a good sound... go fill around your pickup holes with sticky back copper and see what I mean.
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Cheers John... I was inspired by Beetle Juices tempter!.... but its only physics after all !
Been trying telephone coils as well tonight and generally messing about for silly pickup ideas.
Never under estimate your earth field... I think is what I have learnt and nothing happens without a closed loop!!
and aluminium likes to give up its electrons easily.... whatever that means! : >)
i am very interested and that is smart, wish you success :)