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    TLA deficiency
    From: Lu Abel
    Date: 2005 Jun 10, 13:49 -0700

    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?
    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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