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Updated: May 1, 2025
Food, space-plant pills, extra clothing, tools, including a midget atomic earth blaster, grappling hooks nothing was overlooked. "I'd better take along a Damonscope too," Tom reflected. "Judging by those Navy reports, ordinary Geiger counters haven't revealed anything." Tom's Damonscope, one of his early inventions, was a photographic device which worked on fluorescent principles.
It may be remarked that this collection includes the eighteen hundred or more fluorescent salts made by Edison during his experimental search for the best material for a fluoroscope in the initial X-ray period.
The heart of that elder world beat strangely in one of the upper chambers where they came upon a little work-shop, strewn with unknown metals and tools and empty crucibles, and in their midst a rectangular metallic plate partly traced with a device of boughs, appearing, in one light, slightly fluorescent. "It is the work of the Princess Simyra, adôn," said Jarvo.
Finally, in a tube exhausted as highly as possible, he obtained a faint fluorescent glow, like that produced in a Crookes tube. This fluorescence of the glass, according to Dr. Robb, invariably accompanies the discharge of Röntgen rays, and it is likely that these rays are produced more abundantly as the fluorescence increases.
All animal infusions show this fluorescence. The crystalline lens of the eye exhibits the effect in a very striking manner. When, for example, I plunge my eye into this violet beam, I am conscious of a whitish-blue shimmer filling the space before me. This is caused by fluorescent light generated in the eye itself.
So far little had come of X-ray work, but it added another letter to the scientific alphabet. I don't know any thing about radium, and I have lots of company." The Electrical Engineer of June 3, 1896, contains a photograph of Mr. Edison taken by the light of one of his fluorescent lamps.
"At the time I selected tungstate of calcium because it was so fluorescent, I set four men to making all kinds of chemical combinations, and thus collected upward of 8000 different crystals of various chemical combinations, discovering several hundred different substances which would fluoresce to the X-ray.
From afar the French reserves presented the appearance of a nebulous mass, like a low-lying cloud or fog-bank, faintly luminous, shot with fluorescent gleams. As the squadron drew nearer in its desperate charge, the separate forms of the troopers shaped themselves, and the galloping guardsmen grew ghastly with supernatural splendor.
The northern hills were shrouded in darkness; the fires near Kensington glowed redly, and now and then an orange-red tongue of flame flashed up and vanished in the deep blue night. All the rest of London was black. Then, nearer, I perceived a strange light, a pale, violet-purple fluorescent glow, quivering under the night breeze.
When radium was originally discovered, the interest was merely in its curious properties, its power to emit invisible rays which penetrated solid substances and rendered things fluorescent, of expending energy without apparent loss. "Then came the discovery," he went on, "of its curative powers. But the first results were not convincing.
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