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Updated: May 18, 2025
Here again we gave ourselves up to the most minute examination of the many wonders surrounding us, and which shone like prisms by the light of our torches.
What is it that makes common salt crystallize in the form of cubes, and saltpetre in the shape of six-sided prisms? We see no reason why it should not have been just the other way, salt in prisms and saltpetre in cubes, or why either should take an exact geometrical outline, any more than coagulating albumen.
The glare of white light round the sun can be dispersed and weakened to any extent, by augmenting the number of prisms; while a monochromatic light, mixed with this glare, and masked by it, would retain its intensity unenfeebled by dispersion. Upon this consideration has been founded a method of observation, applied independently by M. Janssen in India and by Mr.
However, wherever you meet with them, inform yourself, and minute down a short account of them; they take in all the colors of Sir Isaac Newton's prisms. N. B: When you inquire about them, do not seem to laugh. I thank you for le Mandement de Monseigneur l'Archeveyue; it is very well drawn, and becoming an archbishop.
He found that what seemed to be white light was made up of tints really infinite in number; for though we count only seven prismatic colours, they are shaded off, one into the other, as you see. Having thus broken up the beam of light, Newton, by means of two prisms, put together again the rays which he had separated, and the sunbeam was "white" as before.
The saints are of various orders. Even the diamond books which reflect the light of God so brilliantly may not be all of first water. We must allow for the hues in the less perfect prisms. Were the greatest musical genius in the world to sit before the key-boards he could not draw from a harmonium the notes of a Lucerne organ.
The cavern widened here considerably, the sea forming a little lake. But the roof, the side walls, the end cliff, all the prisms, all the peaks, were flooded with the electric fluid, so that the brilliancy belonged to them, and as if the light issued from them. In the centre of the lake a long cigar-shaped object floated on the surface of the water, silent, motionless.
The stereoscope, which was quite familiar to the parlor of a former generation, consists of two prisms through which the two eyes look toward two photographic views of a landscape. But the two photographic views are not identical. The landscape is taken from two different points of view, once from the right and once from the left.
An elementary consideration suffices to show, that when the directions of vibration of the prisms and the gypsum enclose an angle of forty-five degrees, the colours are at their maximum brilliancy. When the film is turned from this direction, the colours gradually fade, until, at the point where the directions of vibration in plate and prisms are parallel, they disappear altogether.
Christmas morning came, clear, cold, shining bright. A slight thaw the day before had left every bough and twig and pine-needle covered with a moisture that had frozen in the night into glittering crystal sheaths, which flashed like millions of prisms in the sun. The beauty of the scene was almost solemn.
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