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Updated: June 27, 2025
When even the professional photographer has not enough light to get through his orders, how can the amateur get the needed daylight if photography be only the pursuit in spare time? Besides, there are days in our large towns when what daylight there is is so yellow from smoke or fog as to have little actinic power.
"You have heard of the x-rays, no doubt; they are the actinic or ultra violet, which are above the visible light. These light vibrations are of such a character that they penetrate many substances.
In Thackeray's "Lectures on English Humorists" this subtle quality is particularly apparent. Elusive, delicate, alluring it is the actinic ray that imparts vitality. When wit plays skittles with dulness, dulness gets revenge by taking wit at his word. Vast numbers of people taking Thackeray at his word consider him a bitter pessimist.
Further observations were to be made on sound, on solar radiation, on the actinic action of the sun, and on atmospheric phenomena in general.
'Why have we never such magnificence upon our trees at home? 'People say it is the sudden frost striking the sap; or that there is some peculiar power in the sunbeams actinic power, I believe 'tis called to paint the leaves thus; but one thing seems fatal to this supposition, that after a very dry summer the colouring is not near so brilliant as it would be otherwise.
Helen Rexhill had not hitherto experienced real jealousy, but this little photograph excited it. In the highly actinic light of Crawling Water at noon the camera had done its work well, and the figures of the two stood out from the distant background with stereoscopic clearness.
And a Thing came down out of the sky with a terrific velocity. Tracer bullets sprayed all around it. Some could be seen to ricochet off its sides. Flashings came from the alien craft. They were not explosions from guns. They were lurid, actinic, smokeless blasts of pure light. The Thing seemed to be made of polished metal. It dodged, trying to approach the transport.
We seem forced to the conclusion that there was a time when the Pleiades were embedded in a vast nebula resembling that of Orion, and that the cloud has now become so rare by gradual condensation into stars that the merest trace of it remains, and this would probably have escaped detection but for the remarkable actinic power of the radiant matter of which it consists.
I can't give every detail, but I'll summarize the important facts and give our conclusions, which may not be worth an inflated franc. It's hard to judge this dried-up world by earthly standards. "We took pictures of everything possible; I even tried to photograph that gigantic mural in the library, but unless Tweel's lamp was unusually rich in actinic rays, I don't suppose it'll show.
The actinic cloud, as long as it continues blue, discharges polarized light in all directions, but the direction of maximum polarization, like that of skylight, is at right angles to the direction of the illuminating beam. As long as the cloud remains distinctly blue, the light discharged from it at right angles to the illuminating beam is perfectly polarized.
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