tourmaline polariscope

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• polariscope — [ pɔlariskɔp ] n. m. • 1844; de polari et scope ♦ Phys. Appareil d optique permettant de distinguer les rayons lumineux polarisés. Le polariscope d Arago. ● polariscope nom masculin Instrument permettant de voir si une lumière est naturelle ou… …   Encyclopédie Universelle

• Tourmaline — Tour ma*line, n. [F. tourmaline, cf. It. turmalina, tormalina, NL. turmalina, turmalinus; all fr. tournamal, a name given to this stone in Ceylon.] (Min.) A mineral occurring usually in three sided or six sided prisms terminated by rhombohedral… …   The Collaborative International Dictionary of English

• tourmaline tongs — noun plural but sometimes singular in construction : a simple form of polariscope consisting of two transparent plates of tourmaline cut parallel to the optic axis and mounted on a tongs shaped support so that the object to be examined can be… …   Useful english dictionary

• turmaline — Tourmaline Tour ma*line, n. [F. tourmaline, cf. It. turmalina, tormalina, NL. turmalina, turmalinus; all fr. tournamal, a name given to this stone in Ceylon.] (Min.) A mineral occurring usually in three sided or six sided prisms terminated by… …   The Collaborative International Dictionary of English

• Pleocroism — is the property of a crystal to absorb different frequencies of light from different angles. Pleocroitic crystals can appear different colors along different axes.Pleocroism appears to be strongly tied to the structure of the crystal. For example …   Wikipedia

• Polarizer — Po lar*i zer, n. (Physics) That which polarizes; especially, the part of a polariscope which receives and polarizes the light. It is usually a reflecting plate, or a plate of some crystal, as tourmaline, or a doubly refracting crystal. [1913… …   The Collaborative International Dictionary of English