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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: micrometer sextants.
From: Frank Reed
Date: 2007 Nov 04, 21:34 -0500
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 --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to NavList@fer3.com To , send email to NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---
