John, thanks for the clarification, and your patience with my questions.
All, I'm off to buy some photographic mattes to do experiements with. This is all about having a horizontal dial face that is not too bright to view even in the summer midday sun - so I'll go quiet now and report back after the summer solstice.
Steve On 2017-02-28 1:40 AM, John Lynes wrote:
Hi Steve, I'm sorry I've confused you.
...
The take-home conclusion is that there is no single ideal reflectance for the plate of a sundial. It varies with the sky illuminance. When Weber's Law prevails, a reflectance of about 60 per cent is likely to be a safe bet.
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