I have seen several examples of the half hour lines on sundials highlighted by three dots. One example is the 1680 double horizontal on the cover of the recent BSS Bulletin June 2018. Another is Thomas Jefferson’s dial at the museum in St Louis See NASS Compendium, 15, 3 Sept 2008. A third is the Fort Pitt sundial http://sundials.org/index.php/component/sundials/oneDial/641 Here is a picture of a recent dial showing the dots’ http://sundials.org/index.php/component/sundials/oneDial/160
Is this a common style feature? Is it characteristic of a specific location like UK, Scotland or period like 17th 18th century. Are there links to other examples? Any contributions gratefully accepted. Roger Bailey
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