NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: R: Plath Sextant Button
From: RS Peterson
Date: 2003 Nov 25, 20:12 -0600
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 > > 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 -- Robert S. Peterson 31 N Alfred, Elgin IL 60123 USA 847/697-6491 Compass Adjusting for Lake Michigan navigators since 1985 Physics @ Bartlett HS e-mail: rpeterson(at)enc.k12.il.us