This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1833 Excerpt: ...specimens of quartz, M. Biot found that there were several in which the very same phenomena were produced by turning the plate B from left to right. Hence, in reference to this property, quartz may be divided into right-handed and left-handed, quartz. From these interesting facts it follows, that, in passing along the ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1833 Excerpt: ...specimens of quartz, M. Biot found that there were several in which the very same phenomena were produced by turning the plate B from left to right. Hence, in reference to this property, quartz may be divided into right-handed and left-handed, quartz. From these interesting facts it follows, that, in passing along the axis of quartz, polarized light comports itself, at its egress from the crystal, as if its planes of polarization revolved in the direction of a spiral within the crystal, in some specimens from right to left, and in others from left to right. " To conceive this distinction," says Mr. Herschel, " let the reader take a common cork-screw, and holding it with the head towards him, let him turn it in the usual manner as if to penetrate a cork. The head will then turn the same way as the plane of polarization of a ray, in its progress from the spectator through a right-handed crystal, may be conceived to da If the thread of the cork-screw were reversed, or were what is termed a left-handed thread, then the motion of the head as the instrument advances would represent that of the plane of polarization in a left-handed specimen of rock crystal." From the opposite characters of these two varieties of quartz, it follows, that if we combine a plate of right-handed with a plate of left-handed quartz, the result of the combination will be that of a plate of the thickest of the two, whose thickness is equal to the difference of the two thicknesses. Thus, if a plate.jjth of an inch thick of right-handed quartz is combined with a plate Aths thick of left-handed quartz, the same colors will be produced as if we used a plate 735ths of an inch thick of left-handed quartz. When the thicknesses are equal, the plates of course destroy each othe...
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All Editions of A Treatise on Optics; First American Edition, with an Appendix, Containing an Elementary View of the Application of Analysis to Reflexion and Refrac