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Updated: May 23, 2025
Bright enough it looked while it was on the hearth, in the midst of the sea-coal, the great bellows blowing away, and the rod or the horse-shoe as red or as white as the burning coals. How it fizzes as it goes into the trough of water, and how suddenly all the glow is gone! It looks black and cold enough now. Just so with your passionate incandescence.
A great column of smoke, shot with blood-red tongues and darting flashes, rushed up into the sky. It was like some huge giant suddenly standing up, straining upward and abruptly spreading his great arms out across the sky. It cast the night back upon them, utterly hiding and obliterating the incandescence of the sun that rose behind it.
Had simple incandescence by heat been in question, the effect would have been different; the two spectra would have been superposed without prejudice to either. Similarly, the replacement of the hydro-carbon bands in the spectrum of the comet by the sodium line proved electricity to be the exciting agent.
The sun, again, generates heat so rapidly, owing to his great energy of contraction, and loses it so slowly, owing to his great size, that his surface is always kept in a state of incandescence.
M. Desroziers in a series of experiments obtained as much as 250 carcel spherical luminous value per horse-power; this characteristic is one likely to be of great value in electric lighting by incandescence of high intensity. At present only 20-candle lamps are made on the Cruto system.
Koolotah's mother was dying; a desperate desire to save her stirred in his heart as he lifted his whip in the signal to start. The tribe cheered. "Huk! Huk!" he shouted, and his lean dogs followed Ootah's team. "Au-oo-au-oo!" called the natives. "Auoo-auoo!" the voices of Ootah and Koolotah returned. Over the snow-covered stretch of level shoreland the moon poured a flood of silver incandescence.
But Helmholtz's estimate implied an incandescent body cooling keeping up a somewhat equable temperature through contraction for a time, but for a limited time only; destined ultimately to become liquid, solid; to cool below the temperature of incandescence to die. Not only so, but it became possible to calculate the limits of time within which this culmination would probably occur.
Discussion next took place regarding the Welsbach incandescence gas light, which was opened by Mr. McGrilchrist, who remarked on the very fragile and tender nature of the "mantle," and expressed a hope that in this direction improvement might be looked for. Mr. Enoch Station Hotel, where the light has for some time been on exhibition.
In an incandescent lamp quite different considerations apply. There the gas is not at all concerned: the whole of the work is performed on the filament; and the life of the lamp diminishes so rapidly with the increase of the degree of incandescence that economical reasons compel us to work it at a low incandescence.
The substance emitting it was thus present, though in a low state of incandescence. The continuous spectrum was relatively strong; faint traces of the Fraunhofer lines attested for it an origin, in part by reflection; and polarisation was undoubted, increasing towards the limb, whereas in 1870 it reached a maximum at a considerable distance from it.
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