An aethrioscope (or æthrioscope) is a meteorological device invented by Sir John Leslie in 1818 for measuring the chilling effect of a clear sky. The name is from the Greek αίθριος (aíthrios, "fair, cloudless, bright and sunny") and σκοπέω (skopéō, "look at, examine").
An aethrioscope (or æthrioscope) is a meteorological device invented by Sir John Leslie in 1818 for measuring the chilling effect of a clear sky. The name is from the Greek αίθριος (aíthrios, "fair, cloudless, bright and sunny") and σκοπέω (skopéō, "look at, examine").
Source: Wikipedia "Aethrioscope" · CC BY-SA 4.0
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