Lexic.us

Medical Definition of Polars

1. Two polarizing elements in a polarized light microscope. The polar placed between the light source and substage condenser is called the polarizer, the polar placed between the objective and ocular is called the analyser. The vibration directions of the two polars may be crossed 90 degrees, to achieve crossed polars, slightly uncrossing one polar gives slightly uncrossed polars, removing the analyser results in plane-polarized light. (05 Aug 1998)

Lexicographical Neighbors of Polars

Literary usage of Polars

Below you will find example usage of this term as found in modern and/or classical literature:

1. A Treatise on Conic Sections: Containing an Account of Some of the Most by George Salmon (1879)
"Thus, if P and f be the polars of a point with regard to two conies 8, /S', ... Thus, then (see Art. 59), the polars of two points with regard to a system ..."

2. A Treatise on Universal Algebra: With Applications by Alfred North Whitehead (1898)
"(2) The ordinary theorems respecting poles and polars obviously hold. ... The polars of all elements lying in a plane must pass through the polar of the ..."

3. A Treatise on Infinitesimal Calculus: Containing Differential and Integral by Bartholomew Price (1857)
"Thus these two curves are reciprocal to each other; and are called reciprocal polars: to a point on one a tangent on the other corresponds. ..."

4. Chapters on the Modern Geometry of the Point, Line, and Circle: Being the by Richard Townsend (1863)
"Two concentric circles again furnish another obvious example of a pair of figures, reciprocal polars to each other with respect to the concentric circle the ..."

5. Plane and Solid Analytic Geometry by William Fogg Osgood, William Caspar Graustein (1921)
"Properties of Poles and polars. The poles and polars * discussed in this paragraph are all taken with reference to an arbitrarily given conic. ..."

6. Plane and Solid Analytic Geometry by William Fogg Osgood, William Caspar Graustein (1921)
"Properties of Poles and polars. The poles and polars * discussed in this paragraph are all taken ... Let the polars of the points Pi and P2 be Z^ and L2. ..."

7. The Theory of Screws: A Study in the Dynamics of a Rigid Body by Robert Stawell Ball (1876)
"Properties of Screws and their polars.—We add here a few properties which ... If a and /3 be two screws, and if »j and £ be their polars, with respect to a ..."

8. Elementary Co-ordinate Geometry for Collegiate Use and Private Study by William Benjamin Smith (1886)
"Line-Cds. are of special use in dealing with loci of poles and envelopes of polars. If the pole (as to any referee) move on any curve L, its polar will turn ..."

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