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    Re: R: Plath Sextant Button
    From: RS Peterson
    Date: 2003 Nov 25, 20:12 -0600

    Hmmm?  It's been awhile since I rebuilt one of these.  What is the diameter of
    the "orange button"?  Is the button on the "opposite" side of the the drum?
    This model had a completely enclosed battery/push button/light for
    illumination.  If you can pull the button out, you will find a "cylinder" to
    receive this assembly.  It was spring loaded and held an AA batt which just
    fits into the cylinder, piston style.  All of the above is tempered by "I
    think".  -- Bob
    On Tuesday 25 November 2003 01:24 pm,  wrote:
    > 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
    Robert S. Peterson
    31 N Alfred, Elgin IL  60123  USA
    Compass Adjusting for Lake Michigan navigators since 1985
    Physics @ Bartlett HS
    e-mail: rpeterson(at)enc.k12.il.us

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