[EMAIL PROTECTED] wrote:
> Afraid not!
>
> For every inch of water pumped out, the boat will drop one inch lower
> relative to the caisson. But for every inch of water pumped out, the
> caisson will also rise one inch higher in the canal. So the level of
> the top of the boat relative to the tunnel stays constant.
Indeed, once the caisson is buoyant, this will be the case. However, if
the caisson is sufficiently heavy that it is sitting on the bottom of
the canal, you can pump water out of the caisson, the boat will drop and
until neutral buoyancy is achieved the caisson will not rise.
Terry Streeter
NB Arun - Cambrian Wharf
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