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--- Begin Message ---Hi Steve et al, The BSS Glossary has a separate term for dials which aren't the classic elliptical analemmatic type that we understand but does use an analemma in some form. We call these 'analemmic' which covers conventional dials with analemmas drawn on their hour-lines, dials with gnomons shaped like an analemma, and so on. We would encourage others, including the writer(s) of the Wikipedia piece, to use this term! Regards, John----------------------------- Dr J Davis Flowton Dials http://www.flowton-dials.co.uk/ BSS Editor http://sundialsoc.org.uk/publications/the-bss-bulletin/ On Saturday, 1 June 2019, 00:20:02 BST, Steve Lelievre <[email protected]> wrote: Thank you to Joel, Fabio, and Bill. Before I sent off my inquiry last night, I had got as far as deciding the dial must be some kind of Foster-Lambert similar to the Herstmonceux dial that Fabio mentioned, but I was still confused. I'm relieve to learn that it's not related to an analemmatic dial at all, and Wikipedia is simply wrong! Steve On 2019-05-31 5:14 a.m., Bill Gottesman wrote: Hello Steve, I'll take a guess at this. I think the dial is really a heliochronometer with an analemma, not an analemmatic dial. I think the screws up top held a focusing lens or a pinhole aperture that projected a beam on to an analemma on to the lower plate. The analemma is not visible in that picture. The dial is turned to make the beam align, so the hours go counter-clockwise, and the time is read across from stationary indicator at the very top of the dial, hidden from view in this photo. Similar to the upper left dial seen at https://equation-of-time.info/sundials-with-shaped-alidades . -Bill --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
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