Sunshine recorder

Sunshine recorder

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Credit: DAVID HAY JONES/SCIENCE PHOTO LIBRARY

Caption: Sunshine recorder. Modern design of recorder that measures sunshine duration. It uses photo-diodes that alter an electrical signal depending on the amount on sunlight present. Modern designs improve on older designs in several ways. This is a CSD-2 Sunshine Duration Meter from Kipp & Zonen. It can be used at any longitude or latitude. Electrical heaters ensure dew, frost and ice do not interfere with the readings. The design also avoids seasonal effects, producing more accurate readings. It can also be left to run autonomously, as the data is logged through a wire. Photographed at SMHI, the Swedish Meteorological and Hydrological Institute, Norrkoping, Sweden.

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