We can also brush a solution of quinine on the screen, and immediately the place where the ultra-violet rays fall is illuminated by a violet light.
We do not see the ultra-violet rays themselves, but only the rays of increased wave-length, which are emitted by their effect on the sulphate of quinine.
Common machine oil as used for engines also emits greenish rays when excited by the ultra-violet rays, and a very beautiful colour it is.
Daniel Berthelot in France last year announced that he had used the ultra-violet rays to duplicate nature's own process of chlorophyll assimilation.
These ultra-violet rays," he continued, "are always present in an electric arc light though not to a great degree unless the carbons have metal cores.
After that are what are known as the ultra-violet rays, which lie beyond the violet of white light.
You have, as a part of your machine, a peculiarly shaped quartz mercury vapour lamp, and the mercury vapour lamp of a design such as that I saw has been invented for the especial purpose of producing ultra-violet rays in large quantity.
Marshall Ward and others have shown that the blue, violet and ultra-violet rays, but no others, are deleterious to bacteria.
At the same time the influence of violet rays on animal tissue is by no means invariably beneficial; they are often too powerful a stimulant.
Reynolds Green has shown that while the ultra-violet rays have a destructive influence on diastase, the red rays have a powerfully stimulating effect, increasing diastase and converting zymogen into diastase.
If a spark-gap is illuminated by ultra-violet rays, the resistance of the gap is diminished.
The radiant energy emitted by the snow-white flame-arc is a close approximation to average daylight both as to visible and to ultra-violet rays.
One advantage of the radiation from this light-source is that it does not extend far into the ultra-violet, for the ultra-violet rays of short wave-lengths decompose some compounds.
Visible and ultra-violet rays are the radiations almost entirely responsible for photochemical reactions, but the most active of these are the blue, violet, and ultra-violet rays.
The light had to traverse a screen of water before passing through the C, and one of aesculin (which filters out the blue and violet rays) before passing the B.
The lower area of bactericidal action extends much farther to the right, because the quartz allows more ultra-violet rays to pass than does glass.
I believe that such a process might be aided rather than retarded by ultra-violet rays.
We use a quartz lens because glass cuts off the ultra-violet rays.
Mercury vapor lights of that sort are a pretty good source of ultra-violet rays sometimes," went on Haynes.
This singular power is also possessed by the ultra-violet rays of sunshine, as readily shown by an electroscope.
In consequence, however, of their chemical energy these ultra-violet rays are of the utmost importance to the organic world.
By allowing the violet and ultra-violet rays of the spectrum to fall upon sulphate of quinine and other substances Professor Stokes has changed the periods of those rays.
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.
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.
Why, only those rays invisible to the human eye, but which make this piece of willemite glow - the ultra-violet rays.
Luminous radiation of the more refrangible portion of the spectrum; ultra-violet rays; thermal radiation in the infra-red region.
Why, only those rays invisible to the human eye, but which make this piece of willemite glow--the ultra-violet rays.
You have, as a part of your machine, a peculiarly shaped quartz mercury vapor lamp, and the mercury vapor lamp of a design such as that I saw has been invented for the especial purpose of producing ultra-violet rays in large quantity.
The above list will hopefully provide you with a few useful examples demonstrating the appropriate usage of "violet rays" in a variety of sentences. We hope that you will now be able to make sentences using this group of words.
