Shopping & Style11 mins ago
Telegraph GK 6 May
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Thanks in advance to anyone who can tell me what 49 across is (Instrument that is used to measure solar radiation).
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For more on marking an answer as the "Best Answer", please visit our FAQ.Pyranometer - an instrument with a hemispherical field of view, used for measuring total or global solar radiation, specifically global horizontal radiation; a pyranometer with a shadow band or shading disk blocking the direct beam measures the diffuse sky radiation, as is illustrated in the picture below. A picture of the Eppley PSP pyranometer is included in the PSP definition above.