control for multi field pi coils

[bernte_one]

hello

i got an used schiebel AN 19/2 mine detector coil.
while cutting the plug off i got an idea for a control switch for "multi field pi coils".

for example:

first positon- only inner coil is conected
second - only outer coil
third...

[cjc]

The White’s Surfmaster P.I. Dual Field: “An Advanced Guide”

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[cjc]

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with a

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