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Date Posted: Saturday, August 23 2008, 14:00:24
Author: Bob Pass
Subject: mercury lens floation

Recently visited souter lighthouse. Info there states lens weight is 4.5 tons and the mercury used for floation is 1.5tons used. I am sure some old greek said that a floating body displaces its own weight in fluid. so how is this floation achieved. National Trust contact there did not know. I would be interested to know if their info regarding weights is incorrect, or is their an engineering solution such as seals maintaining a mercury pressure above atmospheric. Any info or pointers to it would be greatfully received.

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