DIAMETER (from the Cr. &a, through, µErpov, measure) , in
See also:geometry, a
See also:line passing through the centre of a circle or conic section and terminated by the
See also:curve; the "
See also:principal diameters" of the ellipse and
See also:hyperbola coincide with the "axes" and are at right angles;" conjugate diameters " are such that each bisects chords parallel to the other . The diameter of a
See also:surface is a line at the extremities of which the tangent planes are parallel .
See also:Newton defined the diameter of a curve of any
See also:order as the locus of the centres of the mean distances of the points of intersection of a
See also: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 power of a
See also:lens or microscope . In architecture, the
See also:term is used to
See also:express the measure of the
See also:part of the
See also:shaft of a
See also:column . It is employed by
See also:Vitruvius (iii . 2) to determine the height of a column, which should vary from eight to ten diameters according to the
See also:intercolumniation: and it is generally the
See also:custom to
See also:fix the lower diameter of the shaft by the height required and the Order employed . Thus the diameter of the
See also:Roman Doric should be about one-eighth of the height, that of the Ionic one-ninth, and of the 'Corinthian one-tenth (see ORDER) .
DIAMETERS AND AXES OF
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