On 21/06/2011 18:09, Mike Shaw wrote:
I'm pretty sure there was one of these in an early version of Jane
Walker's "Make a Sundial" British Sundial Society publication.
There is also one on the rear of Jim Morrison's astrolabe.
Mike Shaw
53º 22'N 03º02'W
www.wiz.to/sundials
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Something similar is to be seen in clocks which correct for solar time
via a 'kidney cam'. The Pilkington and Gibbs Heliochronometer uses a
version of it too.
Tony Moss
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