1) Photography equipment
Found on
https://www.crosswordclues.com/clue/actinograph
An actinografo 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. The earliest actinographs were 24-hour recording devices, using a rotating cylinde...
Found on
http://en.wikipedia.org/wiki/Actinograph
instrument used to calculate time of photographic exposure
Found on
http://phrontistery.info/a.html
• (n.) An instrument for measuring and recording the variations in the actinic or chemical force of rays of light.
Found on
http://thinkexist.com/dictionary/meaning/actinograph/
Ac·tin'o·graph noun [ Greek ..., ..., ray +
-graph .] An instrument for measuring and recording the variations in the
actinic or chemical force of rays of light.
Nichol. Found on
http://www.encyclo.co.uk/webster/A/23
actinograph, actinography 1. An instrument, invented by Sir J. Herschel in 1838, for recording the variations in the power of the solar rays. 2. An instrument (of which there are various kinds) used for recording actinic power of light, to determine the correct time of exposure for a photographic plates.
Found on
http://www.wordinfo.info/words/index/info/view_unit/2724/
a recording actinometer.
Found on
https://www.infoplease.com/dictionary/actinograph
No exact match found.
