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There was some discussion on this list on
this, but most questions were solved when I received
the Russian manuals.
SNO-T is Sextan Navigatsionnyi s Osvetitelem v Tropicheskom ispolnenii
(Sextant for Navigation with Illimination, Tropicalized (for use in
Tropics)))
SNO-M: the first three letters mean the same, M apparently stands
for "Modified". About "Modified" I am not 100 sure.

Alex.

On Fri, 10 Jun 2005, Lu Abel wrote:

> I learned a long time ago that if I saw a word or abbreviation with
> which I was unfamiliar to quietly watch the thread and eventually I'd
> understand.  But we people seem to toss SNO, SNO-T and SNO-M around on
> this list, and I've never seen the acronym defined.
>
> For myself (and those as confused, but not as motivated to ask) could
> people please periodically define their acronyms?
>
> Thanks
>
> Lu Abel
>
> Alexandre Eremenko wrote:
> > In Russian sextants, collimation adjustment is
> > not a feature of the sextant, but a feature of the scope.
> > I have never seen an SNO-M in real life, but from the pictures
> > I conclude that they come with two kinds of scopes.
> > (Like SNO-T). It is the UNIQUE Russian INVERTING SCOPE
> > which has the collimation adjustment.
> > I have not seen ANY other scope like that, and I wonder why
> > all Call Nav books still mention this adjustment
> > (which cannot be made on anything but this Russian inverting scope).
> >
> > All kinds of Russian sextants and scopes that I know can be seen in
> > http://www.maurnavy.com/index.html
> > Picture 2 shows an SNO-M with inverting scope (which has collimation
> > adjustment).
> > Picture 1 shows an SNO-T but with ordinary (straight) scope.
> > (New SNO-T come with two scopes: ordinary and inverting)
> > Picture 4 shows some old sextant resembling SNO-M with
> > some old scope (possibly inverting)
> > which also has the collimation adjustment,
> > but this is not the modern inverting scope.
>

   

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