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    Re: R: Plath Sextant Button
    From: Kieran Kelly
    Date: 2003 Nov 26, 09:18 +1100

    Sorry to correct you fellows but you are a bit adrift. The orange button on
    the back of the micrometer housing on a Plath Professional is to activate
    the two lights for reading the sextant - one on the arc and one on the
    micrometer. The batteries are stored in the cavity in the micrometer housing
    in front of the button. The battery cavity is accessed by turning the orange
    button and pulling it out. It then simply snaps back into the housing when
    the batteries are inserted. The button has no function relating  to
    adjustment of the micrometer and the batteries on a Professional are
    definitely not in the handle. If you examine the handle you will see it is
    Kieran Kelly
    -----Original Message-----
    From: Navigation Mailing List
    Sent: Wednesday, 26 November 2003 6:24 AM
    Subject: Re: R: Plath Sextant Button
    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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