[GreenKeys] Open lines?

[Sam Hallas]

Sheldon Daitch wrote:
>  Check out:
>
> 
http://www.strombergcarlsontelephone.com/kellogg/PDF/1917_BLTN_98_REPEATING_COILS_PHANTOM_CIRCUITS.pdf

That's a really excellent article, Sheldon. It also bears out my 
statement that you can make 7 circuits out of 4-pairs (ie 8 wires) using 
two phantoms and a double phantom. It also confirms what I suspected 
about transpositions being important.

Cheers,
Sam