NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Polarising Filters
From: Clive Sutherland
Date: 2007 Nov 24, 14:29 -0000
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From: Clive Sutherland
Date: 2007 Nov 24, 14:29 -0000
Hi Again:
In this recent Mailing. I attached an earlier version of
the 'Polarisation.doc' file by mistake and consequently it was missing some
edits and also Fig 1. which showed a graph
of the transmission formula.
The fig 176 (referred to in section 2) was never copied from
the original source book. However if anyone needs this, please reply
and I will copy it out and send it to the list .
Sorry about this problem with my finger!
Clive.
----- Original Message -----From: CliveTo: NavList@fer3.comSent: Thursday, November 22, 2007 6:42 PMSubject: [NavList 4012] Polarising FiltersHi all,In view of the recent interest in these filters I have extracted a reference article to help those who are unfamiliar with using polaroid. It was written by an highly regarded astronomer but I have edited it to make it more suitable for the NavList. It is quite an old article and does not have any references to Nematic materials but useful nontheless. I am sending it as a WORD 2003.doc attachment so that I can include a chart.If anyone is unable to read it come back to me and I will send something else off-listThere is an good idea lurking here! How about, for a 21 cent Sextant, using a Liquid crystal filter in front of the sextant telescope fed from a hand-held so as to produce an opaque 'Sun' or 'Moon' or 'bright sea' just where it is needed to block off the dazzle. I don't think anyone has yet thought of that!Clive.
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File: 104055.polarisation.doc
