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Updated: May 1, 2025
He showed, moreover, that the incident beam, although not sensibly weakened in luminous intensity, lost, in its transmission through the solution of sulphate of quinine, the power of producing the blue fluorescent light. Sir David Brewster also worked at the subject; but to Professor Stokes we are indebted not only for its expansion, but for its full and final explanation.
It used to be said with great certainty that you cannot see through a brick wall, but by means of X-rays and a fluorescent screen it is now possible to do so. I have seen my own heart beating as its image was thrown on the screen by the Rontgen rays. Many insects, birds and animals have keener perceptions in some respects than man.
In short, they now claim that every human being is radio-active, and that the auric radiation may be registered and perceived by means of a screen composed of certain fluorescent material, interposed between the eye of the observer, and the person observed.
Then the canopy of heaven became a mighty loom, wherein imperial purple and deep sea-green blended, wove, and interwove, with blazing woof and flashing warp, till the most delicate of tulles, fluorescent and bewildering, was daintily and airily shaken in the face of the astonished night. Without warning the span was sundered by an arrogant arm of black. The arch dissolved in blushing confusion.
We have the fact that light falling on the platinum electrode of a voltameter generates a current, first observed, I think, by Sir W. R. Grove at any rate, it is mentioned in his "Correlation of Forces" extended by Becquerel and Robert Sabine to other substances, and now being extended to fluorescent and other bodies by Prof. Minchin.
On the inside of this is spread a layer of tungstate of calcium. By placing the object to be observed, such as the hand, between the vacuum-tube and the fluorescent screen, the "shadow" is formed on the screen and can be observed at leisure. The apparatus has proved invaluable in surgery and has become an accepted part of the equipment of modern surgery.
I also found that this tungstate could be put into a vacuum chamber of glass and fused to the inner walls of the chamber; and if the X-ray electrodes were let into the glass chamber and a proper vacuum was attained, you could get a fluorescent lamp of several candle-power. I started in to make a number of these lamps, but I soon found that the X-ray had affected poisonously my assistant, Mr.
Through the fast-waning light and far, far away miles it seemed on high and many, many miles in length a broad band of fluorescent amethyst shone. From it dropped curtains, shimmering, nebulous as the marching folds of the aurora; they poured, cascaded, from the amethystine band.
A little peep-hole enabled him to see the patient and the X-ray apparatus, while an arrangement of mirrors and a fluorescent screen enabled him to see exactly what the X-rays were disclosing, without his leaving the lead-lined cabinet. "I can think of no more perfect protection for either patient or operator," said Kennedy admiringly. "By the way, did Mrs. Close come alone?"
We are, perhaps, still ill informed as to the phenomena of luminescence in which undulations are produced in a complex manner, as in the case of a stick of moist phosphorus which is luminescent in the dark, or in that of a fluorescent screen.
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