Schematic help

I am looking at a schematic at
http://www.timgoldstein.com/cnc/GeckoG320Wiring.pdf and I have a
couple of questions if anyone would not mind. I know that a few
people had lent their skills in creating this schematic, so maybe
someone might be able to help me.

I am looking at the 2 transformers(110 VAC input, 24VAC output)
and how they connect together. My question is: Is there anything
special with the connection of the 2 transformers?

This is how I think the connection should go together.? The
transformers have a black and a white wire each(mine do
anyway,outputs 28 volts AC. Both transformers are the same). The
black is tied together from one transformer to the other and the same
goes for the white. Then the combined black and the combined white
connect to their respective points on the rectifer bridge. Is this a
correct asumption of this connection?

Will connecting the black to black and white to white wires
together double the voltage or more likely just increase(double)the
current?

John