Actinograph
id:
actinograph-239-9198684
title:
Actinograph
text:
An actinograph 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 cylinder of photographic paper exposed through a wedged-shaped slit to record a graph of actinic light during the period of a day; hence the graph suffix in a
brand slug:
wiki
category slug:
encyclopedia
description:
Instrument for measuring a light source's ability to expose photographic film
original url:
https://en.wikipedia.org/wiki/Actinograph
date created:
date modified:
2023-04-19T07:29:47Z
main entity:
{"identifier":"Q2089276","url":"https://www.wikidata.org/entity/Q2089276"}
image:
{"content_url":"https://upload.wikimedia.org/wikipedia/commons/5/55/HD_Actinograph.jpg","width":721,"height":877}
fields total:
13
integrity:
15