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ACTINOMETER (Gr. locals, ray, ,arpov,...

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Originally appearing in Volume V01, Page 157 of the 1911 Encyclopedia Britannica.
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See also:

ACTINOMETER (Gr. locals, See also:ray, ,arpov, measure) , an See also:instrument for measuring the See also:heating and chemical effects of See also:light. The name was first given by See also:Sir See also:John See also:Herschel to an apparatus for measuring the heating effect of See also:solar rays (Edin. Journ. See also:Science, 1825); Herschel's instrument has since been discarded in favour of the pyrheliometer (Gr. aGp, See also:fire, ijXios, See also:sun). (See See also:RADIATION.) The word actinometer is now usually applied to See also:instruments for measuring the actinic or chemical effect of luminous rays; their See also:action generally depends upon photo-chemical changes (see PHOTO-See also:CHEMISTRY). Certain See also:practical forms are described in the See also:article See also:PHOTOGRAPHY.

End of Article: ACTINOMETER (Gr. locals, ray, ,arpov, measure)

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