Universal Sundial
Some time back, son M. and I designed a universal sundial which was capable of being snapped flat. This was published (trigonometry and all) in the journal The Compendium. I am hoping for opportunity yet to popularise our design. And so I had a special interest in ordering a universal sundial from Austria this week (pictured) -- very different in appearance and principle to ours, but also capable of being snapped flat. It is a "pocket watch".
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