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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.
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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
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patented a device for estimating the actinic power of sunlight and for computing exposure times and apertures for cameras, based on the
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is an instrument for measuring or estimating the amount of light available, in terms of its ability to expose
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Mapping the
Spectrum: Techniques of Visual Representation in Research and Teaching
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The actinograph: An instrument for observing and recording changes in radiation
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Instrument for measuring a light source's ability to expose photographic film
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184:(April 1911) Quarterly Journal of the Royal Meteorological Society
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98:, time of day, time of year, and latitude. These were
79:in 1845, as an improvement on T. B. Jordan's 1839
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146:The Year-book of Facts in Science and Art,
148:London: Simpkin, Marshall, and Co., 1846
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209:This photography-related article is a
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31:Description of R. Hunt's actinograph
23:Hurter & Driffield's actinograph
77:Royal Cornwall Polytechnic Society
51:intensity of light, as opposed to
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164:, Oxford University Press, 2002,
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123:(a type of actinograph)
92:Vero Charles Driffield
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260:Photography equipment
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188:no. 158, pp, 163–168
127:Hurter and Driffield
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121:Pyranometer
116:Actinometer
100:slide rules
96:plate speed
73:Robert Hunt
69:actinograph
57:photometric
53:radiometric
37:actinograph
254:Categories
133:References
81:Heliograph
67:suffix in
86:In 1888,
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45:actinic
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