Noun Actinograph Definition and Examples
Pronunciation:
/akˈtɪnəɡrɑːf//akˈtɪnəɡraf/
Definition:
1.noun
An instrument for recording variations in the intensity of solar radiation.
Photography. A form of calculator for estimating the actinic power of daylight, to aid in determining an appropriate exposure. Now historical.
((n.) An instrument for measuring and recording the
variations in the actinic or chemical force of rays of light.)
Origin:
Mid 19th century; earliest use found in John Herschel (1792–1871), mathematician and astronomer. From actino- + -graph.
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