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John Herschel's drawing of an actinometer, c 1830s.

Herschel, John F W (John Frederick William), Sir

John Herschel's drawing of an actinometer, c 1830s.
4 0 c m
actual image size: 21cm x 32cm


Experiment 969 from John Herschel's own notebook. An actinometer is an instrument for measuring the intensity of radiation, especially ultraviolet radiation. Herschel (1792-1871) was an English astronomer, mathematician and chemist who discovered 525 nebulae and clusters. He pioneered celestial photography and invented the cyanotype or blueprint proces.

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