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Winding first coil



I am in process of winding my first coil.
Does anyone know how the system would perform if the primary was
wound from 2mm seven-strand twisted copper wire, instead of a single
solid. 

I've seen an article where the author claims a frequency change when
one move the primary remotely up or down the length of the secondary,
and that both coils were under oil.
The secondary output arcs over onto a large cheese wedge shaped plate
whose opposite end was connected to the secondary ground via an
isolator switch.  The different frequencies could be seen as light colour
changes over the plate.
Does anyone have any more regarding this topic.
 

Cheers all 
Dave.  (Using Steve's email)