I invite every one to help guess phrases from Stanley Meyers hand writings the missing word correctly
Hmm in the image, isn't he grounding all the positive output from the full bridge rectifiers?
While the drawing does appear to show an Isolation transformer for each one...they are usually 1:1 ratio.
We also know a variac is not an isolation transformer...
Looking at the waveform to the right of T1 it shows a positive pulse wave...
I think the diodes are just drawn backwards...
While it could work with one transformer, I don't think it would work with two the way it is shown... IC9 would also have to be a negative voltage regulator, which I don't believe it is.
If you look at D7... all the circuit becomes useless when SW1 is in the UP position.
Between D7 and DB nothing would work.
So I'm fully convinced in this drawing the diodes are simply shown incorrectly.
Good catch Belfior.