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n.1.An instrument for measuring and recording the variations in the actinic or chemical force of rays of light.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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Here the climate and small staff atmosphere must have appeared not particularly unfamiliar to his experience in Antarctica (in those early days of the Lab we undertook all hourly observations out-of-doors, which even included defrosting the globe on the actinograph before each sunrise with bare hands).
Solar radiation is measured by instruments such as radiometers, bimetallic actinographs and more recently, pyranometers, which is most used in Brazil (Dornelas et al., 2006).
Global solar radiation measurements are generally made with the actinographs which are often not reliable due to the need of routine calibration of thermal sensitivity of the mechanical components of their sensors.