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- Actinograph abstract "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 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 actinograph. Such devices were developed and described by Robert Hunt, secretary of the Royal Cornwall Polytechnic Society in 1845, as an improvement on T. B. Jordan's 1839 Heliograph.In 1888, Ferdinand Hurter and Vero Charles Driffield patented a device for estimating the actinic power of sunlight and for computing exposure times and apertures for cameras, based on the plate speed, time of day, time of year, and latitude. These were slide rules, not measuring instruments, and did not produce a graph, but Hurter and Driffield adopted the same name for it.In 1911, Arthur William Clayden M.A. (Fellow of the Royal Meteorological Society and Principal of the Royal Albert Memorial University College of Exeter) developed a version of an actinograph for meteorologists, to observe and record the change of radiation.".
- Actinograph thumbnail Actinograph_1846.png?width=300.
- Actinograph wikiPageID "8666294".
- Actinograph wikiPageLength "2324".
- Actinograph wikiPageOutDegree "14".
- Actinograph wikiPageRevisionID "641002503".
- Actinograph wikiPageWikiLink Category:Photography_equipment.
- Actinograph wikiPageWikiLink Ferdinand_Hurter.
- Actinograph wikiPageWikiLink Film_speed.
- Actinograph wikiPageWikiLink Hurter_and_Driffield.
- Actinograph wikiPageWikiLink Photographic_film.
- Actinograph wikiPageWikiLink Photometry_(optics).
- Actinograph wikiPageWikiLink Pyranometer.
- Actinograph wikiPageWikiLink Radiometry.
- Actinograph wikiPageWikiLink Robert_Hunt_(scientist).
- Actinograph wikiPageWikiLink Royal_Cornwall_Polytechnic_Society.
- Actinograph wikiPageWikiLink Slide_rule.
- Actinograph wikiPageWikiLink Vero_Charles_Driffield.
- Actinograph wikiPageWikiLink File:Actinograph_1846.png.
- Actinograph wikiPageWikiLink File:HD_Actinograph.jpg.
- Actinograph wikiPageWikiLinkText "actinograph".
- Actinograph wikiPageUsesTemplate Template:Photo-stub.
- Actinograph subject Category:Photography_equipment.
- Actinograph hypernym Instrument.
- Actinograph type Agent.
- Actinograph comment "An actinografo is an instrument for measuring or estimating the amount of light available, in terms of its ability to expose photographic film.".
- Actinograph label "Actinograph".
- Actinograph sameAs Q2089276.
- Actinograph sameAs أكتينوغراف.
- Actinograph sameAs تابهسنج.
- Actinograph sameAs Actinographe.
- Actinograph sameAs Актинограф.
- Actinograph sameAs m.027d6wx.
- Actinograph sameAs Актинограф.
- Actinograph sameAs Aktinograf.
- Actinograph sameAs Q2089276.
- Actinograph wasDerivedFrom Actinograph?oldid=641002503.
- Actinograph depiction Actinograph_1846.png.
- Actinograph isPrimaryTopicOf Actinograph.