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    Re: R: Plath Sextant Button
    From: Phil Camera
    Date: 2003 Nov 25, 19:24 +0000

    Yes Federico the button is inline with the micrometer drum and that must be 
    it's function.  Normally batteries for lights on sextants are stored inside 
    of the handle but this sextants handle is open and I see no other place for a 
    light.  I believe it was manufactured in 1977 and therefore has no light.  It 
    is in excellent shape and I am very pleased to receive it.  Tnx for your 
    help.  Phil
    > Hi,
    > I'm not sure but if the orange button is coaxial with the micrometer
    > knob, it should serve to null the index error so you don' have to take
    > it into account when you reduce the sight since what you read is
    > directly the sextant altitude (intrumental altitude +/- index error).
    > Hope can help.
    > Federico
    > -----Messaggio originale-----
    > Da: Navigation Mailing List [mailto:NAVIGATION-L@LISTSERV.WEBKAHUNA.COM]
    > Per conto di 
    > Inviato: marted� 25 novembre 2003 15.36
    > Oggetto: Plath Sextant Button
    > Hi everyone, I'm new to this list.  I've just obtained a very nice Plath
    > Navistar Professional sextant and have a dumb question.  On the back of
    > the micrometer drum is an orange plastic button.  What does that do?  Is
    > it for a light to reading the vernier?  If so, where and how does one
    > change the batteries?  I didn't get a manual with the unit.  Tnx in
    > advance, Phil

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