A set of celestial coordinates based on the celestial equator as the primary great circle. Also called EQUINOCTIAL SYSTEM OF COORDINATES.

A set of celestial coordinates based on the celestial equator as the primary great circle. Also called EQUINOCTIAL SYSTEM OF COORDINATES.

Related Terms 
GEARBOXA system of gears which alter the ratio between the revolution of the engine and the propeller shaft so the propeller operates in a relatively efficient speed range. By using a gearbox the engine and the propeller shaft will revolve at different speeds. 
DISTORTION

DEAD TIME

POLEPOSITIONING
A design technique used in linear control theory in which many or all of a system's closedloop poles are positioned as required, by proper choice of a linear state feedback law; if the system is controllable, all of the closedloop poles can be arbitrarily positioned by this technique.

PNEUMATIC WEIGHING SYSTEM
A system for weight measurement in which the load is detected by a nozzle and balanced by modulating the air pressure in an opposing capsule.

PLENUM SYSTEM
A heating or air conditioning system in which air is forced through a plenum chamber for distribution to ducts.

PLANT DECOMPOSITION
The partitioning of a largescale control system into subsystems along lines of weak interaction.

PIECEWISE LINEAR SYSTEM
A system for which one can divide the range of values of input quantities into a finite number of intervals such that the output quantity is a linear function of the input quantity within each of these intervals.

PHOTOELECTRICLOOPCONTROL
[CONTSYS] Aphotoelectric control system used as a position regulator for a loop of material passing from one stripprocessing line to another that may travel at a different speed. Also known as loop control.

PHOTOELECTRIC SORTER
A photoelectric control system used to sort objects according to color, size, shape, or other lightchanging characteristics.

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