In Biot's earlier experiments the beam of light employed was nearly parallel: the phenomena of rings and brushes that are seen with a conical pencil of light were discovered by Sir David Brewster in the case of uniaxal crystals in 1813 and in that of biaxal crystals in 1815. [Please select]
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That same year Brewster discovered those magnificent bands of colour that surround the axes of biaxal crystals. [Please select]
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