NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Wolfgang Köberer
Date: 2009 Oct 6, 17:21 +0200
This instrument has also
been described in more detail in:
Hydrographic Review, Vol.
8 (1931), No. 2, 146 – 153.
It has been patented in
Dr.
Wolfsgangstr. 92
D-60322 Frankfurt am Main
Tel: + 49 69 95520851
Fax: + 49 69 558400
e-mail: koeberer@navigationsgeschichte.de
Von:
Gesendet: Dienstag, 6. Oktober
2009 16:07
An:
Betreff: [NavList 10076] Re:
Instrument for HA, Lat ... of points on the Sumner line may be directly obs at
sea
Hi there dw
First link does not seem to contain any article - second one works
fine.
Regards
Doug
On Tue, Oct 6, 2009 at 8:14 PM, dw <waldendand@yahoo.com> wrote:
Appears to be a device which combines the mechanical solution using
arcs, of the navigation triangle with a bubble sextant and a number of
prisms. My quick read says you set the dec, the assumed lat, center
the object in the bubble, and read out the LHA. OR set dec, LHA,
center obj and read out lat. Two settings and sights (assumed/read
out dec and LHA changing, the Alt may be the same ((or close))), and
you have you Sumner line!
http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?1927PASP...39..305K&data_type=PDF_HIGH&whole_paper=YES&type=PRINTER&filetype=.pdf
and the patent (US Pat 1,852,166):
http://www.google.com/patents/download/A_COPARTNERSHIP_CONSISTING_OF.pdf?id=gYFZAAAAEBAJ&output=pdf&sig=ACfU3U3ICy-mooq_x6rZq2CH-C2rAiDK4A
H-C2rAiDK4A
<br
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