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Date Posted: Tuesday, November 04 2008, 7:22:36
Author: Bob Pass
Subject: Re: mercury lens floation
In reply to: Kevin Mulcahy 's message, "Re: mercury lens floation" on Tuesday, October 21 2008, 8:53:15

Further to the comments of Gerry Douglas-Sherwood I am now convinced that the mercury floatation system used is at atmospheric pressure. Thinking about it, if a sealed system was adopted then a high density fluid would not be required, and water or oil would surely have been used.
With regard to Kevin Mulcahy’s posting I believe he has been mislead by the fact that like most people he would not have seen a large quantity by weight of mercury, and therefore find it difficult to envisage how very small its volume is compared to more familiar materials (more than thirteen times smaller than that of water remeber). His second sentence that mercury can support many times its own weight should surely instead say that it can support many times the weight of an equal volume of water.

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