What happened in the 1830s?
🔬 1839: John Herschel invents the actinometer, an instrument for measuring the intensity of solar radiation.
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Further Reading
The Dynamic Measurement and Utilization of Solar Heat (scientificamerican.com)
Pioneers in Optics: Pavel Alekseyevich Cherenkov and John ... (cambridge.org)
What is an Actinometer? - AZoSensors (azosensors.com)
John Herschel - Biography, Facts and Pictures - Famous Scientists (famousscientists.org)
Pioneers in Optics: Marie Alfred Cornu and John Frederick William ... (cambridge.org)
Actinometer - Invented by John Herschel - Edubilla.com (edubilla.com)
Actinometer: Measure Solar Radiation Intensity on Earth | Blog (wordpress.com)
Cyanomicon - Mike Ware (co.uk)
Actinometry; photon flux (rp-photonics.com)