NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Polarising Filters
From: Clive Sutherland
Date: 2007 Nov 22, 18:42 -0000
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From: Clive Sutherland
Date: 2007 Nov 22, 18:42 -0000
Hi 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-list
There 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: 104012.polarisation.doc
