No, the scope can't trace backward.
No it can't but you know exactly what I am talking about positive becomes minus and minus
becomes positive. And the scope traces downward instead of upward but left to right.
And all through this site you see post refering to line 1 as phase one and line two as phase two
when taliking about single phase. And if the two secondary windings are a 180 degrees offset
that is the same thing as being two phases.
And if the two winding are hooked in series and out of phase 180 degrees there would be no
voltage between line #1 and Line #2.