This is one of the most fascinating analogue instruments I have seen.
Simple, elegant, rugged and functional, this instrument is called the Campbell Stokes Sunshine Recorder. It was invented in the mid 1800s, and the design remains more or less the same today. At a time when just about everything works on electronic sensors and wireless transmission, this equipment contains just three components - a metal base, a glass ball and a piece of paper.
Once properly aligned to the correct latitude-longitude, the instrument simply catches the suns rays throughout the day and burns a line through the blue-paper (the "sunshine-card"), placed at its base. The stronger the sunlight, the broader and deeper the burn!
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REFERENCES
https://en.wikipedia.org/wiki/Campbell%E2%80%93Stokes_recorder
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