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Hewitt S., you wrote:
"I'm trying to restore an Ebbco sextant. What I need is a set of shades and
the spring retainer for the horizon mirror or an entire horizon mirror
assembly. The model I have is the later one with the larger mirrors and
three index-mirror shades."

If you don't get any hits on this after a week, let me know. There are
several at Mystic Seaport (for classroom use, not in the collections) that
are in various states of repair, and it may be possible to cannibalize the
parts you need.

And you wrote:
"FWIW : I used an Ebbco for years and it always stayed true to the DR
and always got me there."

True to the DR meaning...? As long as the fix and the DR were not more than
perhaps five miles apart, you would have considered that acceptable, right?
So random errors even as large as +/-2 minutes (on top of inescapable
observation errors) would have been hard to detect in the pre-GPS era.

Just so there's no misunderstanding, I always recommend plastic sextants to
people who want to do standard, basic LOP celestial navigation. But I would
note that I frequently find that the sorts of people who are interested in
celestial today are also interested in owning an instrument that they can be
proud of, and for reasons which are only partly rational, plastic sextants
don't make the cut.

 -FER



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