Campbell-Stokes sun recorder. Designed to record the hours of bright sunshine by focusing the sun's rays through a glass sphere which will burn a hole through a card.
Previously:
Solar furnace mirror - photo
English/metric measurement error in the Mars Climate Orbiter
New plans added on 11/20: Click here for 2,589 plans for homemade tools.
high-side (Jul 23, 2020), Karl_H (Jul 21, 2020), nova_robotics (Jul 20, 2020), Rangi (Jul 29, 2020)
The top cap is skewed. I wonder if that is intentional - fine adjustment for example - or an oversight while setting up for the photo.
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