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    Re: Hughes explanation of Chichester's navigation.
    From: David Pike
    Date: 2014 Dec 4, 10:10 -0800

     

    Hanno.  Just when your friends think they’ve got it sorted out, introduce bubble size into the argument.  It’s easier to judge the centre of a tiny bubble, but it seems to be less responsive than a large bubble.  It’s probably due to some sort of square/cube law between volume and surface area.  I seem to remember being told the ideal bubble had a diameter 2/3 of the distance between the tramlines, or was it 1/3 of the distance?  We always tried to grab a pendulous reference model, which had a pendulous mirror on a quartz thread instead of a bubble, and a London Underground Sign to aim with.  Then you didn’t have to worry about making a suitable bubble.

     



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