Thank you very much for your comments. I should have checked the URL for Karl's page; I see now that I consulted it a bit over a year ago. I have two questions, one sensible (I hope), the other quite childish, which I hope you will forgive! You noted "Because of the thickness of the two plates the slots needed to be of different widths. This was the most difficult part of the calculation". Here, I imagine, that the slots on the 'sun side' had to be wider than those on the 'dial side'. Is the best width of the slots something one determines by experiment, depending on the size of the dial and the thickness of the blocks? Secondly, your reference to the articles in the Compendium reminded me of something quite silly. In Figure 7 of the first article there is a drawing of a handsome gentleman with a beard looking at the shadow of a string. As one does when one tries to imagine the face of a person whose voice one hears on the radio, I have wondered, more than once, whether there is any resemblance to Fer,or Mac or Bill...!

   warmest wishes,

Peter


--
Peter Mayer
Politics Department
Adelaide University, AUSTRALIA 5005
Ph    : +61 8 8303 5606
Fax   : +61 8 8303 3446
e-mail: [EMAIL PROTECTED]

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