Peter Stockdale wrote:
> Ah - yes - the concept develops .
> Pump water IN not
>
> Quoting Steve -
>
> Suppose your boat floated into a tank which was quite
> deep, say 5ft draught or so. The door is closed and the water pumped
> out. The whole lot will stay afloat as some of the water has been
> replaced by air, but the roof of your boat will be maybe 18 inches
> lower, depending on draught as it sits on the bottom of the tank.
>
> Would this work...?
>
> not OUT !
>
> The French method obviously worked and obeys Archemedes.
Excuse the crude graphics, but hopefully this will explain how Steve's
idea would work. Best viewed in a fixed pitch font!
| |
| |
\ /
___|__\ /__|___
| \ / |
| \__________/ |
| |
| |
| |
--------------------
Caisson, sat on bottom of canal, water level in caisson same as outside.
Boat in caisson and caisson doors shut.
| | | |
| | | |
___| \ / |___
| \ / |
| \ / |
| \__________/ |
--------------------
Pump water OUT of the caisson, caisson floats higher in the water, but
the boat sinks to bottom of caisson, overall height above water level
reduced.
Also obeying Archemedes!
Terry Streeter
NB Arun - Cambrian Wharf
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