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    Re: Bubble sextant development
    From: David Pike
    Date: 2016 May 2, 13:57 -0700

    Debora Warner is very good on the development of US sextants with a fair amount of passing reference to European ones.  One fact I did learn from her paper was that Kollsman developed pendulous mirror peri-sextants simultaneously with the bubble variety.  I’d always assumed that pendulous mirrors came last, because that’s the order they came with Smiths peri-sextants.  I can remember seeing the title of a paper comparing the accuracy of bubble versus pendulous mirror, but now I can’t find it.  I think it was in an early ‘Journal of Navigation’.  Like they say, never move on until you’ve made a note. DaveP

    I have attached a description of the development of aviation sextants.  gl

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