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    Re: micrometer sextants.
    From: Frank Reed
    Date: 2007 Nov 04, 21:34 -0500

    Of the 1930 Brown's Nautical Almanac, I wrote:
    "One ad shows a high-end vernier sextant that has a micrometer drum, too."
    
    And Wolfgang added:
    "That was patented by C.Plath in 1921."
    
    So then perhaps the delay in English sextants was simply because no English
    manufacturer was willing to pay patent royalties until they knew there was
    strong market demand for micrometer sextants (??). And about Plath, do you
    know: did they begin manufacturing such sextants in 1921? Or was that the
    patent date only?
    
     -FER
    http://www.HistoricalAtlas.com/lunars
    
    
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