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Updated: May 4, 2025
Sir D. Brewster imagines that the non-luminous rays of caloric, which form a constituent part of the solar light, are emitted by the dark nucleus of the sun; whilst the visible coloured rays proceed from the luminous matter by which the nucleus is surrounded.
In the first lecture, while discussing the theory of luminous flames, I pointed out that, in an atmospheric burner, it was not the oxygen of the air introduced combining with and burning up the hydrocarbons, and so preventing the separation of incandescent carbon, which gave the non-luminous flame, but the diluting action of the nitrogen, which acted by increasing the temperature at which the hydrocarbons are broken up, and carbon liberated, a fact which was proved by observation that heating the mixture of gas and air again restored the luminosity of the flame.
Intercepting by a plate of this glass the light from an oil flame, and operating upon the transmitted invisible heat, he obtained effects of polarization, far exceeding in magnitude those which could be obtained with non-luminous sources.
This is best seen when the gas is turned low with a batswing burner, for instance turned so low that only a small non-luminous flame is left, the space between burner and flame will appear as great as the flame itself, while, if the gas is mixed with an inert diluent like carbon dioxide, the space can be very much increased.
This was again a non-luminous body, and indeed cast a shadow over the face of the embryo student. One by one Mr. Simon handed him all he held. Out of the score there were three Cosmo said he understood, and four he thought he should understand if he were allowed to read them over two or three times. But Mr. Simon laid them all together again, and back into the drawer.
And if one wants to boil a kettle, it will be done, not by putting it into a non-luminous flame, and so interfering with the combustion, but by holding it near to a freely burning regenerated flame, and using the radiation only. Making toast is the symbol of all the heating of the future, provided we regard Mr. Siemens' view as well established.
Or some may prefer the explanation, based on a theory of Wilsing's, that two great bodies, partially or wholly opaque and non-luminous at their surfaces, but liquid hot within, approached one another so closely that the tremendous strain of their tidal attraction burst their shells asunder so that their bowels of fire gushed briefly visible, amid a blaze of spouting vapors.
I have proved this by taking a small platinum pipe, with a circular loop on the end, the interior of the loop being pierced with minute holes, and by making a circular flame burn within the loop so that the non-luminous zone of the flame just touched the inside of the loop, and then by aspiration so gentle as not to distort the shape of the flame, withdrawing the gases escaping from the outer zone.
The man started off down the path, the little girls ran grumbling indoors. The sky was clear, there was still a crystalline, non-luminous light in the under air. Aaron rummaged in his shed at the bottom of the garden, and found a spade and a box that was suitable. Then he came out to his neat, bare, wintry garden.
Thus when the Rabbis say that Moses saw God through a luminous mirror, and the other prophets through a non-luminous, the meaning is that Moses had intellectual and moral perfection, so far as a human being is capable of having them, and the only partition separating him from a complete vision of God was his humanity.
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