See Wheatstone's Polarizing Sundial by Jim Mahaffey in The Compendium
8(2):1-3, Jun 2001. This is an expanded version of his article that first
appeared in Optics and Photonic News, 11(7):14-15, Jul 2000.
Fred
On Mon, Mar 30, 2015 at 12:24 AM, Roger Bailey rtbai...@telus.net wrote:
Hello
--- Original Message ---
From: Fred Sawyer fwsaw...@gmail.com
Sent: 30 March 2015 13:38
To: Roger Bailey rtbai...@telus.net
Cc: Sundial Mailing List sundial@uni-koeln.de
Subject: Re: Clouding the issue
See Wheatstone's Polarizing Sundial by Jim Mahaffey in The Compendium
8(2):1-3, Jun 2001
--- Original Message ---
From: Fred Sawyer fwsaw...@gmail.com
Sent: 30 March 2015 13:38
To: Roger Bailey rtbai...@telus.net
Cc: Sundial Mailing List sundial@uni-koeln.de
Subject: Re: Clouding the issue
See Wheatstone's Polarizing Sundial by Jim Mahaffey in The Compendium
8(2):1-3, Jun 2001
March 2015 5:24 p.m.
To: peter.ma...@adelaide.edu.au; sundial@uni-koeln.de
Subject: Re: Clouding the issue
Hello Peter and all,
Yes, clouds are a significant, perhaps the overwhelming issue with sundials.
Night knocks out half the time and clouds at least half of the remaining
daylight hours. Our
That is an excellent question! I have seen this photo before, and never
noticed the numbers running twice in a semicircle. I, too, am perplexed.
I read about this dial in Hester Higton's book Sundials at Greenwich.
The dial operates on two successive polarizations of light - the first
being
Hello Peter and all,
Yes, clouds are a significant, perhaps the overwhelming issue with sundials.
Night knocks out half the time and clouds at least half of the remaining
daylight hours. Our BSS colleagues know the problem. The most common sundial
motto is I count only the sunny hours. This is
