Word: nicol
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Dates: during 1884-1884
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...among American colleges, has paid attention to this science. As if by magic, one versed in this wonderful science can look through solid rock and tell what lies hidden far within. The tool of the petrographist is a polarizing microscope, that is, an ordinary compound microscope in which two Nicol's prisms of Iceland spar are placed at a certain distance apart...