actinograph
Sign in to saveright|thumb|300px|Hurter & Driffield's actinograph right|thumb|300px|Description of R. Hunt's actinograph
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right|thumb|300px|Hurter & Driffield's actinograph right|thumb|300px|Description of R. Hunt's actinograph
An actinograph is an instrument for measuring or estimating the amount of light available, in terms of its ability to expose photographic film. That is, it measures the actinic or chemical intensity of light, as opposed to radiometric or photometric amount of light.
Excerpted from Wikipedia’s “actinograph” article, available under the CC BY-SA 4.0 licence.