grid


grid
/grid/, n.
1. a grating of crossed bars; gridiron.
2. Elect.
a. a metallic framework employed in a storage cell or battery for conducting the electric current and supporting the active material.
b. a system of electrical distribution serving a large area, esp. by means of high-tension lines.
3. Electronics. an electrode in a vacuum tube, usually consisting of parallel wires, a coil of wire, or a screen, for controlling the flow of electrons between the other electrodes.
4. Survey. a basic system of reference lines for a region, consisting of straight lines intersecting at right angles.
5. a network of horizontal and perpendicular lines, uniformly spaced, for locating points on a map, chart, or aerial photograph by means of a system of coordinates.
6. Archit. a rectangular system of coordinates used in locating the principal elements of a plan.
7. grillage.
8. Football. gridiron (def. 1).
[1830-40; short for GRIDIRON]

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      in an electron tube, an electrode that has openings for controlling the flow of electrons or ions through it. Unmodified, the term applies to a control grid that is ordinarily placed between the cathode and the anode (or plate) of an electron tube to vary the flow of current. A screen grid—usually maintained at a fixed potential—is placed between a control grid and an anode to reduce the electrostatic influence of the anode on the control grid. A suppressor grid is interposed between two positive electrodes—usually the screen grid and the anode—to reduce the flow of secondary electrons from one to the other.

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Universalium. 2010.

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