>When I did this with the big dial I first set out a parallel noon gap near
the plate edge expecting the shadow to fill this at noon!! It was only
when I came to observe this in sunlight that I found the apparent shadow
was less than 10" wide because of the umbra/penumbra effect. The shadow
was *
-Original Message-
From: John Carmichael [mailto:[EMAIL PROTECTED]
Sent: Saturday, February 09, 2008 10:07 AM
To: 'Tony Moss'
Subject: Shadow Tapering
Dear Tony (I'm ccing The List on your letter because it is a great new
observation that The List has never discussed before. Your observat
