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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
hollow.

Kieran Kelly

-----Original Message-----
From: Navigation Mailing List
[mailto:NAVIGATION-L@LISTSERV.WEBKAHUNA.COM]On Behalf Of 
Sent: Wednesday, 26 November 2003 6:24 AM
To: NAVIGATION-L@LISTSERV.WEBKAHUNA.COM
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
> A: NAVIGATION-L@LISTSERV.WEBKAHUNA.COM
> 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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