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What is it?

What is it?

Answers on a postcard please!

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Well done Lifeboy.
I saw this on the RNLI jetty at Girvan some years ago, but it had gone when I made a recent return visit. I didn't know the full name of the device, but had worked out that it must use some kind of heat sensitive paper which then gives an indication of the strength of the sunshine, and the time of day.
Obviously they have removed this thing in case it spontaneously combusts in the wonderful weather we have had since July!
 

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We had one at school,Many years ago, you put the card around the back there are two types depending on if you are in the northern or southern latitudes
 

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Hi,

It's sunshine recorder used by meteorological observers. The magnifying glass focusses the suns rays to burn a track in the card behind so they can work out how many hours of sunshine each day.

gwzm

PS Only used in fixed locations.
 

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