I have read various books about Ford, and I have picked up that the
transmission the old man put in the Model T was sort of ahead of its
time.

A friend has a Nissan Murano (did I spell that right?)  anyway, from
what he says, I think it has the planetary transmission like HF1 put in
the Model T.

Now I understand how the standard transmission woks.  I understand about
gear ratios, and about overdrive.  Also, what with the proliferation of
Voith couplings in the Industrial world, I understand how your basic
automatic transmission works (or, if you prefer, "fluid drive").  But
the planetary transmiission that was in the Model T, I do not understand.

Any help?

H.