Noun Actinograph Definition and Examples


Noun:

Actinograph

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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