. The Bell System technical journal . How the kind of polarization changes with crystal thickness. Fig. —The normascope principle along X. If the reference surface is the reference table of a simple stauro-scope the edge of the first crystal will appear dark because a = 0° or 90°;the edge of the second crystal will appear bright because a is not 0° or 90°.Actually this a for an AT plate can be ±35° d= any multiple of 90° becausewe dont know whether z stands out to the right or to the left. Hence the SPECIFYING QUARTZ CRYSTAL ORIENTATION 247 reading might be, for instance, -35°, +35, +55°,
. The Bell System technical journal . How the kind of polarization changes with crystal thickness. Fig. —The normascope principle along X. If the reference surface is the reference table of a simple stauro-scope the edge of the first crystal will appear dark because a = 0° or 90°;the edge of the second crystal will appear bright because a is not 0° or 90°.Actually this a for an AT plate can be ±35° d= any multiple of 90° becausewe dont know whether z stands out to the right or to the left. Hence the SPECIFYING QUARTZ CRYSTAL ORIENTATION 247 reading might be, for instance, -35°, +35, +55°, +125°, etc. This isthe principle of the normascope used to identify the .v direction for crystaladjustment. Let us study these relative phase shifts at different angles near the opticaxis. Now quartz has an optical complication beyond that just described—it rotates the plane of polarization of plane polarized light traveling alongthe optic axis. This complicates our present attempt to build up a back-ground sufficient for an understanding of the conoscope. But the cono-scope find
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
