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Updated: May 22, 2025
Professor Stokes, the occupant of the chair of Newton in the University of Cambridge, has demonstrated this change of one kind of light into another, and has pushed his experiments so far as to render the invisible rays visible. A large number of substances examined by Stokes, when excited by the invisible ultra-violet waves, have been proved to emit light.
This deportment of fluor spar determined Stokes in his choice of a name for his great discovery: he called this rendering visible of the ultra-violet rays Fluorescence. By means of a deeply coloured violet glass, we cut off almost the whole of the light of our electric beam; but this glass is peculiarly transparent to the violet and ultra-violet rays.
"They are invisible to ordinary light but not to ultra-violet light. While most of the ultra-violet is deflected and flows around the ship of else is absorbed, I have an idea that, if we bathe it in a sufficient concentration of ultra-violet, some would be reflected. We are going to look for the reflected portion." "Ultra-violet light is invisible." "It is to the eye, but it can be detected.
They hardly ever have to swing past the vertical, and even if one shines right through you you can look it right in the eye as long as you want to it can't hurt you a bit." "No ultra-violet at all?" "None whatever. Just a color one of the many remaining crudities of our ultra-light vision.
It may be merely another phase of the spectrum not simply the unexplored regions of the infra-red or the ultra-violet, but a region co-existent with what we normally apprehend, and making itself manifest through apertures in what we, with our extremely limited sense- grasp, think to be a continuous spectrum. I throw out the idea mainly as a suggestion. It is not necessarily the true explanation.
Truth is one, and the Source is one; the channels of communication alone are different. But truth in its finality, the Absolute, the noumenon that is the substance of phenomena, is in itself not a thing that can be directly apprehended by man; it lies within the "ultra-violet" rays of his intellectual spectrum.
This was the first pitfall into which an experimentalist was liable to fall. If prisms were used for obtaining the spectrum, then precautions had also to be taken, since all glass absorbed a portion of the ultra-violet rays and some the infra-red. On the whole, he considered that the best glass to use was pure white flint glass for the collimator, the prisms, and the camera lens.
But though the blue, violet, and ultra-violet rays can act thus upon certain substances, the fact is hardly sufficient to entitle them to the name of 'chemical rays, which is usually applied to distinguish them from the other constituents of the spectrum.
Ritter discovered in 1801 that beyond the extreme violet of the spectrum there is a vast efflux of rays which are totally useless as regards our present powers of vision. These ultra-violet waves, however, though incompetent to awaken the optic nerve, can shake asunder the molecules of certain compound substances on which they impinge, thus producing chemical decomposition.
The explosion of light, we witnessed, was dangerous in its consisting almost wholly of very short and hard infra-X-rays." The physicist had a special term for what we know as ultra-violet light. To him, blue was ultra-violet, and exceedingly dangerous to red-sensitive eyes. To him, our ultra-violet was a long X-ray, and was designated by a special term.
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