I like the idea of a 10 decade resistor box with steps of infinity ohms. Regular calibration required at a price .. well .. how about make it infinite as well for neatness.
I have actually seen it. I remember this guy who made these open ended copper coils to correct for "bad energy" that you mounted on something like a fence post.
To "tune" the coils, he used a dowsing pendulum and a box he made full of rotary 10 position switches. I had a look inside, and each switch had a single wire going to it. He actually sincerely believed in what he was doing, and he was incredibly proud of his box.