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Original file (943 × 943 pixels, file size: 58 KB, MIME type: application/pdf) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
A Campbell–Stokes sunshine recorder. A sunshine recorder is a device that records the amount of sunshine at a given location or region at any time. The results provide information about the weather and climate as well as the temperature of a geographical area.
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A pyrheliometer is an instrument that can measure direct beam solar irradiance. [1] Sunlight enters the instrument through a window and is directed onto a thermopile which converts heat to an electrical signal that can be recorded. The signal voltage is converted via a formula to measure watts per square metre.
Weather stations typically have these following instruments: . Thermometer for measuring air and sea surface temperature; Barometer for measuring atmospheric pressure; Hygrometer for measuring humidity
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In other designs the current through the filament is kept constant, and the radiation allowed through from the target object is varied with calibrated attenuating wedges in the optical path, [3] or a prism is used to place the images of the target object and a calibrated glowing surface next to each other, e.g. as a disk inside a ring.
Example of a pyrgeometer. A pyrgeometer is a device that measures near-surface infra-red (IR) radiation, approximately from 4.5 μm to 100 μm on the electromagnetic spectrum (thereby excluding solar radiation).