PRISM (Gr. rrpiva, properly a thing sawn, Irpii"ety, to saw)

This article appears in Volume V22, Page 361 of the Encyclopedia Britannica.

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PRISM (Gr. rrpiva, properly a thing sawn, Irpii"ety, to saw) , in geometry a solid enclosed by plane surfaces, two of which, termed the ends, are parallel, equal, similar and similarly situated polygons, and the faces connecting the ends are parallelograms, equal in number to the sides of the

polygon

POLYGON (Gr. rroXus, many, and ywvia, an
angle
- ANGLE (from the Lat. angulus, a corner, a diminutive, of which the primitive form,
  angus
  - ANGUS, EARLS OF
  , does not occur in Latin; cognate are the Lat. angere, to compress into a bend or to strangle, and the Gr. ayKOS, a bend; both connected with the Aryan root ank-, to
)

. If the faces be perpendicular to the ends the prism is a " right prism," and the faces are rectangles; otherwise the prism is " oblique." The

axis

AXIS (Lat. for " axle ")

is the line joining the centres of the ends. It may be generated by moving a plane (corresponding to an end or base) parallel to itself. A prismoid differs from a prism in having for its ends two dissimilar parallel figures. For illustrations see CRYSTALLOGRAPHY, and for the mensuration see that

article

ARTICLE (from Lat. articulus, a joint)

. In

optics

OPTICS

the word denotes a triangular prism, i.e. one having a triangle for base, used to decompose

white

WHITE
WHITE, ANDREW DICKSON (1832– )
WHITE,
GILBERT
- GILBERT
- GILBERT (KINGSMILL) ISLANDS
- GILBERT (or GYLBERDE), WILLIAM (1544-1603)
- GILBERT, ALFRED (1854– )
- GILBERT, ANN (1821-1904)
- GILBERT, GROVE KARL (1843– )
- GILBERT, J
- GILBERT, JOHN (1810-1889)
- GILBERT,
  MARIE
  - MARIE
  DOLORES ELIZA ROSANNA [" LOLA MONTEZ "] (1818-1861)
- GILBERT, NICOLAS JOSEPH LAURENT (1751–1780)
- GILBERT, SIR HUMPHREY (c. 1539-1583)
- GILBERT, SIR JOSEPH HENRY (1817-1901)
- GILBERT, SIR WILLIAM SCHWENK (1836– )
(1720–1793)
WHITE, HENRY KIRKE (1785-1806)
WHITE, HUGH LAWSON (1773-1840)
WHITE, JOSEPH BLANCO (1775-1841)
WHITE,
RICHARD
- RICHARD
- RICHARD (d. 1184)
- RICHARD, FRANCOIS
  MARIE
  - MARIE
  BENJAMIN (18,9-1908)
- RICHARD, HENRY (1812-1888)
- RICHARD, ST
GRANT (1822-1885)
WHITE, ROBERT (1645-1704)
WHITE, SIR GEORGE STUART (1835– )
WHITE, SIR THOMAS (1492-1567)
WHITE, SIR WILLIAM ARTHUR (1824--1891)
WHITE, SIR WILLIAM HENRY (1845– )
WHITE, THOMAS (1628-1698)
WHITE, THOMAS (c. 1550-1624)

light. (See

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