Hi Smudge,
Yes, that's a very reasonable explanation for the seeming nodal effect. This particular type of coil, later becoming the Ruhmkorff coil, was mostly used in medicine. I'll try to find an old experiment that shows this nodal effect around an induction coil with a galvanometer to make sure. Or such a test could be done in this forum with Allcanadian's cores. Even if the nodal effect exists, I'm not sure if it is caused by domain motional effects. There are voltage standing waves in the coil anyway, based on the coil length.
Hi Grumage,
Yes, I agree, putting the thick secondary wire on the outside of the thin primary wire is unusual. But Wattsup is right, Cook does specify this in the patent. Looking at Tesla magnifying transmitter, you do see a large outside wire around a small inside one, but there the outside coil is the primary...so Cook is in effect reversing the pri and sec of the magnifying transmitter setup.
His explanation for using thick secondary wire is:
By this combination the initial secondary current of the primary helix being very small in quantity in comparison to the terminal secondary current of the secondary helix offers but little resistance to the terminal secondary, hence a quicker action is secured ;
This is confusing to me, but I guess it has something to do with reducing the resistance so that the current can grow maximally in the secondary. I found reference to 'small coil' and 'large coil' secondaries in the lit, so still info gathering about that.
orthofield
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