Robert,
I've been trying to visualise your "engine shafts [which] are sunk directly
below the wheel". Are you sure? If so, it must have been a very wet shaft
- with water dropping from the wheel etc.
Do you mean that the wheel was alongside the shaft, so that its crank could
operate rods directly down the hole? That too would have space issues -
with the top needing to be large enough to accommodate the sweep of the
crank. There are plenty of shafts where the shaft is a short distance from
one end of the pit (giving space for the circular motion to be converted
into a reciprocating one).
Mike Gill
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