See also:

• DIAMETER (from the Cr. &a, through, µErpov, measure)

DIAMETER (from the Cr. &a, through, µErpov, measure)  , in See also:

• GEOMETRY

geometry, a See also:

• LINE

line passing through the centre of a circle or conic See also:

• SECTION
• SECTION (Lat. sectio, cutting, secare, to cut)

section and terminated by the See also:

• CURVE (Lat. curvus, bent)

curve; the "See also:

• PRINCIPAL

principal diameters" of the See also:

• ELLIPSE (adapted from Gr. EXkei 'tc, a deficiency, iXXeirely, to fall behind)

ellipse and See also:

• HYPERBOLA

hyperbola coincide with the "axes" and are at right angles;" conjugate diameters " are such that each bisects chords parallel to the other . The See also:

• DIAMETER (from the Cr. &a, through, µErpov, measure)

diameter of a See also:

• QUADRIC

quadric See also:

• SURFACE

surface is a line at the extremities of which the tangent planes are parallel . See also:

• NEWTON
• NEWTON, ALFRED (1829–1907)
• NEWTON, JOHN (1725-1807)
• NEWTON, JOHN (1823-1895)
• NEWTON, SIR CHARLES THOMAS (1816-1894)
• NEWTON, SIR ISAAC (1642-1727)

Newton defined the diameter of a curve of any See also:

• ORDER
• ORDER (through Fr. ordre, for earlier ordene, from Lat. ordo, ordinis, rank, service, arrangement; the ultimate source is generally taken to be the root seen in Lat. oriri, rise, arise, begin; cf. " origin ")
• ORDER, HOLY

order as the See also:

• LOCUS (Lat. for " place "; in Gr. rinros)

locus of the centres of the mean distances of the points of intersection of a See also:

• SYSTEM

system of parallel chords with the curve; this locus may be shown to be a straight line . The word is also used as a unit of linear measurement of the magnifying See also:

• POWER [WILLIAM GRATTAN] TYRONE (1797-1841)

power of a See also:

• LENS
• LENS (from Lat. lens, lentil, on account of the similarity of the form of a lens to that of a lentil seed)

lens or See also:

• MICROSCOPE (Gr. µucp6s, small, asenreiv, to %view)

microscope . In See also:

• ARCHITECTURE (Lat. architectura, from the Gr. ap)(LTEKrwv, a master-builder)

architecture, the See also:

• TERM

term is used to See also:

• EXPRESS (through the French from the past participle of the Lat. exprimere, to press out, by transference used of representing objects in painting or sculpture, or of thoughts, &c. in words)

express the measure of the See also:

• LOWER

lower See also:

• PART

part of the See also:

• SHAFT
• SHAFT (O. Eng., sceaft, from scafan, to shave; the word is common to Teutonic languages)

shaft of a See also:

• COLUMN (Lat. columna)

column . It is employed by See also:

• VITRUVIUS (MARCUS VITRUVIUS POLLIO)

Vitruvius (iii . 2) to determine the height of a column, which should vary from eight to ten diameters according to the See also:

• INTERCOLUMNIATION

intercolumniation: and it is generally the See also:

• CUSTOM (from O. Fr. costume, costume or coustume; Low Lat. costuma, a shortened form of consuetudo)

custom to See also:

• FIX, THEODORE (180o-1846)

fix the lower diameter of the shaft by the height required and the Order employed . Thus the diameter of the See also:

• ROMAN

Roman Doric should be about one-eighth of the height, that of the Ionic one-ninth, and of the 'Corinthian one-tenth (see ORDER) .