Sun and shade analysers
David Pilling (Tue, 31 Dec 2019 04:34:49 PST)

Hi,

On 30/12/2019 22:14, George Koulomzin wrote:

Reference to a discussion early in December which can be seen in the
list archive here:

https://pacificbulbsociety.org/pbslist/…

--
David Pilling
http://www.davidpilling.com/
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