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Hello Bill

I sent you a question through your blog regarding the Freiberger Yacht
sextant, but I am not sure it went through. If not, please let me know and I
will send it again via the forum.

Thanks

Zvi


-----Original Message-----
From: Bill Morris
Sent: Monday, April 02, 2012 9:04 PM
To: zvidoron@btinternet.com
Subject: [NavList] Re: Oil for Sextants, Chronometers, etc.

I whole-heartedly agree with Ridge White.

I use a thin smear of waterproof marine grease for all moving areas of the
sextant except for the rack, where a plain SAE30 lubricating oil seems to be
of the correct viscosity. Excess grease and oil can play no part in
lubrication and, as Ridge observes, it captures dust that eventually forms
an effective grinding paste.

I suggest that sextants should, like mechanical clocks, be serviced
occasionally, say every five years, so the grease can be renewed. Left for
many years it eventually assumes the consistency of one of its main
ingedients, soap.

Eventually, experienced experts like Ridge will all have disappeared, so
it's as well to learn how to do an overhaul yourself. It's not difficult and
you need not be terrified (as I once was) that you will destroy the
instrument's accuracy for ever.

Bill Morris
Pukenui
New Zealand
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