. American journal of pharmacy. Fig. Fig. 4 In figure 4, the three hexagonal plates exhibit the same phe-nomena ; a and b cross each other at 90°,whilst the plate c intersects them at 45°,passing between them; the half crystald pentagonal in form, is the polarizedspace, and No. 2, where c interposes, pro-ducing pink as before ; spaces 1 and 3 arepartially polarized and darkened. When a pair of these crystals at rightangles are viewed with a single tourma-line, or Nichols prism, the crystal, whoseaxis is transverse that of the tourmaline, is black as night, whilstthe other, whose axis is pa
. American journal of pharmacy. Fig. Fig. 4 In figure 4, the three hexagonal plates exhibit the same phe-nomena ; a and b cross each other at 90°,whilst the plate c intersects them at 45°,passing between them; the half crystald pentagonal in form, is the polarizedspace, and No. 2, where c interposes, pro-ducing pink as before ; spaces 1 and 3 arepartially polarized and darkened. When a pair of these crystals at rightangles are viewed with a single tourma-line, or Nichols prism, the crystal, whoseaxis is transverse that of the tourmaline, is black as night, whilstthe other, whose axis is parallel with that of the tourmaline, isperfectly transparent, as in fig. 5. If the tourmaline is now
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Keywords: ., bookcentury1800, bookdecade183, booksubjectpharmacy, bookyear1835
