Dear Jim, I have just published a small book 'A Study of the Quadrant' that does have a few pages about the Gunter device. It has just 6 pages describing their use and functions with various photographs. Your book on 'The Astrolabe' was very useful to me in producing my book. Thank you. Another useful book is by John Locke called 'Understanding the Gunter Quadrant'. It has 69 pages and is printed by Brabourne Books.
I will send you a copy of my chapter on Gunter to your personal Email address. Best wishes, Mike. ----- Original Message ----- From: James E. Morrison To: sundial@uni-koeln.de Sent: Tuesday, May 13, 2014 2:40 AM Subject: Re: Altitude dials as compasses This discussion has not included noting the capabilities of quadrants. There are several stereographic quadrants that provide the solar azimuth for a date and solar altitude. Among them are Gunter's quadrant (if azimuth curves are include), the Islamic quadrant based on a folded astrolabe and Sutton's quadrant which uses a southern projection. Of the several, Sutton's quadrant is the easiest to use and the most precise for its size. I am not aware of much in print about Sutton's quadrant other than the chapter in "The Astrolabe". I can easily generate recreations if there is an interest/need. Best regards, Jim James E. Morrison janus.astrol...@verizon.net Astrolabe web site at http://astrolabes.org
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