# Directrix

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## directrix

[də′rek·triks]
(mathematics)
A fixed line used in one method of defining a conic; the distance from this line divided by the distance from a fixed point (called the focus) is the same for all points on the conic.
A curve through which a line generating a given ruled surface always passes.

## Directrix

in artillery, a specially equipped sector of an artillery range or troop training center: targets are installed, artillery fire positions and observation points are rigged out, and so on. These sectors are designed for artillery fire (artillery directrix), tank fire (tank directrix), antiaircraft artillery fire against ground targets (antiaircraft artillery directrix), and other weapons.

## Directrix

(of a ruled surface), a curve along which a point on a line moves such that the ruled surface is circumscribed by the motion of the line. Any curve intersecting all the generatrices may be taken as the directrix.

References in periodicals archive ?
2, one can determine the cutting speed vector considered at the generator point M on the directrix trajectory [D.
When students have found the points that are twice as far from the focus as they are from the directrix (r = 2 l) they can join them to form an hyperbola with eccentricity e = 2.
It is worth noting that due to our choices, the components of the directrix of the cone [[^.
Since P is on the perpendicular bisector of AF, it must be equi-distant from the directrix DA and the focus F.
We look forward to establishing the Directrix Tech center on the West Coast, the entertainment capital of the world," said Roger Faherty, CEO of Directrix.
Contributions at the theory of the Generation of the Directrix and Generatrix Curves of the Geometrical Surfaces.
From its East Coast operations center in Northvale, NJ, Directrix currently provides Internet encoding services for short student films that are featured on Hollywood.
Practically, at the generation of the complex real surfaces the curve C as circular helix is generated as directrix D of the surface.
Playboy is pleased to continue its successful relationship with Directrix," Jim English, President, Playboy Entertainment Group, said.
DIRECTRIX offers a number of services including digital video playback and uplink, satellite space segments, digital video archiving and trafficking, video Internet streaming, digital ad insertion, and digital archiving and distribution for VOD (Video on Demand) platforms.
He brings to DIRECTRIX over twenty years of a senior-level experience in Pay-TV and Pay-Per-View subscription and transactional sales and marketing.
NEW YORK) Directrix Reports Results for Its First Year As

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