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Campbell Stokes sunshine recorder, which are not in general use anymore, but it's an interesting historical instrument.
It records sunshine by burning a trace on a daily paper log that can then be measure in length to quantify daily sunshine. Designed in the late 1800's data from such devices have been used to build historical databases for solar resources assessment worldwide.
Original public domain image from Flickr
Public DomainFree CCO U.S. Government image for Personal and Business use
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