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Updated: May 26, 2025
The twilight had fallen, and the shores of the river were lost in dusk. The surface of the water itself shone with an added luminosity, reflecting the sky. In the middle distance twinkled a light, beyond which in long stretches lay the sombre marshes. "That's the club," said Orde. "Now, if you disgrace me, you old duffer, I'll use you as a decoy!"
But its cause is known to them; the strange phenomenon being due to the fact that the sun, for some time after it has sunk below the horizon, continues to shine on the glistening ice of the glaciers and the snow of the mountain summits, thus producing a weird luminosity in the heavens, somewhat resembling the Aurora Borealis. He discovered the Straits, or, more properly, Strait, in 1519.
I should imagine from what he says that the coloring of vegetation is in great part the merest tintage, the large admixture of white giving to it a startling luminosity, and permitting the fullest effect of those neutral tints which are capable of combinations at once so restful and so pleasing to the refined eye.
The slightest movement in the water caused a flash of light. Jerry and I agreed that we had never seen anything more beautiful. The doctor told us that this phosphorescence or luminosity of the ocean is caused by a minute animal, scarcely perceptible to the naked eye, though sufficient to tinge the water of a brown or reddish colour. Other marine substances are, however, luminous.
But it seemed to me, and the closer I watched him the more convinced I became, that this was no optical illusion, that a faint luminosity, a sort of elfin light, played eerily about his head! As Bristol and Mostyn approached the case the old man began to walk toward me and in the direction of the door.
Did an extinguished sun, flying blindly through space, plunge into a vast cloud of meteoric particles, and, under the lashing impact of so many myriads of missiles, break into superficial incandescence, while the cosmical wrack through which it had driven remained glowing with nebulous luminosity? Such an explanation has been offered by Seeliger.
In the broken light his eyes shone with a curious luminosity of their own, absorbed, introspective. All the windows were dark, and the entrance-hall, when he slipped in between the pillars, but across its floor he saw light thrown in a yellow ribbon from the half-closed door of the drawing-room. It took his attention, laid hands on his imagination. He began to struggle against it.
Now, it is common to say, merely, in explanation of this luminosity, that the gas highly heated in combustion is self-incandescent. This explanation, however, has not been experimentally confirmed. Dr Werner Siemens was, therefore, led recently to investigate whether highly-heated pure gases really emit light.
It was observed that though the individual stars were too small to be seen severally without optical aid, yet such was their incredible number that the celestial radiance produced that luminosity with which every stargazer was so familiar.
Having now brought before you the various methods by which ordinary coal gas can be enriched, so as to give an increased luminosity to the flame, I wish now to discuss the methods by which the gas can be burnt, in order to yield the greatest amount of light, and also the compounds which are produced during combustion.
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