Pyrheliometer used for direct measurement

Pyrheliometer used for direct measurement

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Credit: Dorling Kindersley/UIG/SCIENCE PHOTO LIBRARY

Caption: Pyrheliometer, used for direct measurement of solar radiation, invented by Knut Angstrom.

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Keywords: 1900s, 20th century, accuracy, ball, close-up, dark, detail, direct, directly above, glass, ideas, innovation, instrument of measurement, knut angstrom, learning, metal, old fashioned, pyrheliometer, radiation, reflection, shadow, single object, solar, studio shot, sunlight, the past, weather, white background

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