The principles of light and color: including among other things the harmonic laws of the universe, the etherio-atomic philosophy of force, chromo chemistry, chromo therapeutics, and the general philosophy of the fine forces, together with numerous discoveries and practical applications .. . Fig. i7s. POLARIZED LIGHT. 407 tirely to its direction, which is evidently not the case withtourmaline, Iceland spar, and various other crystals. If weshould suppose a beam of solar ethers to approach at right an-gles to the line 3, 4, and strike at the points 1, 3, is it notevident that it would deflect th
The principles of light and color: including among other things the harmonic laws of the universe, the etherio-atomic philosophy of force, chromo chemistry, chromo therapeutics, and the general philosophy of the fine forces, together with numerous discoveries and practical applications .. . Fig. i7s. POLARIZED LIGHT. 407 tirely to its direction, which is evidently not the case withtourmaline, Iceland spar, and various other crystals. If weshould suppose a beam of solar ethers to approach at right an-gles to the line 3, 4, and strike at the points 1, 3, is it notevident that it would deflect the line 3, 4, much more than itwould the line I, 2, from striking the former squarely, and thelatter only obliquely? In other words, may not the line 2, 4, bethrown so far around as to cause what is called an extraordinaryrefraction, while I, 2, is thrown into merely refraction ?Fig. 179, which I take from Guillemins Forces of Nature, will. Fig. 179. The Polarizer and Analyzer. illustrate this subject of double refraction and that lias been doubly refracted by passing through one ofthese crystals, becomes so modified or shorn of some of its ele-ments of power that it is said to be polarized. In the diagram,SI is a line of light which falls upon a crystal of Iceland Spar at is there refracted into what is called the ordinary ray IR, andthe extraordinary ray IR. If we intercept one of the rays by ascreen and pass the other through another crystal of IcelandSpar, it will be again divided into an ordinary ray IR, and anextraordinary one IR. The lens LL is used to concentratethe light upon a screen, while the second crystal is made to re-volve and show the variety of intensity and color which its dif-ferent positions produce. The first crystal is called the polar-izer, the second, the analyzer, from the fact that it analyzes thelight, and shows what modifications have been produced by thepolarizing inf
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectcolor, booksubjectpho
