Definition of actinograph in English:

actinograph

noun akˈtɪnəɡrɑːfakˈtɪnəɡraf

1An instrument for recording variations in the intensity of solar radiation.
2Photography. A form of calculator for estimating the actinic power of daylight, to aid in determining an appropriate exposure. Now historical.

Mid 19th century; earliest use found in John Herschel (1792–1871), mathematician and astronomer. From actino- + -graph.

noun

1An instrument for recording variations in the intensity of solar radiation.
2Photography. A form of calculator for estimating the actinic power of daylight, to aid in determining an appropriate exposure. Now historical.

Mid 19th century; earliest use found in John Herschel (1792–1871), mathematician and astronomer. From actino- + -graph.

词汇	actinograph
释义	Definition of actinograph in English: actinograph noun akˈtɪnəɡrɑːfakˈtɪnəɡraf 1An instrument for recording variations in the intensity of solar radiation. 2Photography. A form of calculator for estimating the actinic power of daylight, to aid in determining an appropriate exposure. Now historical. Origin Mid 19th century; earliest use found in John Herschel (1792–1871), mathematician and astronomer. From actino- + -graph. Definition of actinograph in US English: actinograph noun 1An instrument for recording variations in the intensity of solar radiation. 2Photography. A form of calculator for estimating the actinic power of daylight, to aid in determining an appropriate exposure. Now historical. Origin Mid 19th century; earliest use found in John Herschel (1792–1871), mathematician and astronomer. From actino- + -graph.
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