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Re: Alternate methods of sight reduction
From: Wolfgang K?berer
Date: 2005 Dec 11, 18:45 +0100

Dear Jim,

concerning the Bygrave Slide Rule there is an article by Colin Barnes in the "Slide Rule Gazette, Inaugural Issue Autumn 2000", p. 7 - 11, which gives most of the initial information you may need. Colin Barnes, who is one of the moving forces in the UK slide rule collector community, may be contacted under this e-mail adress: cb01@sliderules.org.uk; if the "Slide Rule Gazette" is sold out you may get a copy of his article from him.

Apart from that you can look up the patent for the Bygrave Slide Rule under this URL:

http://12.espacenet.com/espacenet/viewer?PN=GB162895&CY=gb&LG=en&DB=EPD.

Hope this helps.

W. Köberer

[Dr. Wolfgang Köberer] -----Ursprüngliche Nachricht-----
Von: Navigation Mailing List [mailto:NAVIGATION-L@LISTSERV.WEBKAHUNA.COM]Im Auftrag von Jim Hickey
Gesendet: Dienstag, 6. Dezember 2005 21:47
An: NAVIGATION-L@LISTSERV.WEBKAHUNA.COM
Betreff: Alternate methods of sight reduction

Alternate methods of sight reduction

First, allow me to introduce myself as a new member. My name is Jim Hickey. My wife Judy and I currently live aboard our sailboat in St. Augustine, Florida. I have been interested in celestial navigation for many years much to the amusement and entertainment of my wife! Even got the programming bug early on but have it under reasonable control at this time. It has been a delight to read many of the fascinating postings for some time now.

I have a volume of Bowditch that discusses a variety of sight reduction methods. I believe all the old table methods and more have been discussed. Has anyone had access to or knowledge of the old slide rule type method that is referenced? I believe the instrument was called a Bygrave computer which looked cylindrical.

As well, there is also a picture of a wonderfully elegant looking globe like device that is set up with sliding arms that solves the navigational triangle directly.

I have been intrigued by these items for years and of course would love to mess with them if I had the chance as I am sure many here would.

Very curious to know how effective these approaches were and if there are others etc. etc.

Cheers,

Jim

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