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As applied to celestial lines of position, the movement of each of three or four intersecting lines of position an equal amount, in the same direction toward or away from the celes- tial bodies, so as to bring them as nearly as possible to a common intersection. When there are more than four lines of position, the lines of position in the same general direction are combined to reduce the data to not more than four lines of position.

Related Terms

POPPET VALVE

A cam-operated or spring-loaded reciprocating-engine mushroomtype valve used for control of admission and exhaust of working fluid; the direction of movement is at right angles to the plane of its seat.

POINT OF CONTRAFLEXURE

A point at which the direction of bending changes. Also known as point of inflection.

PLUNGE

To set the horizontal cross hair of a theodolite in the direction of a grade when establishing a grade between two points of known level.

PIPEWORK SEE PIPING. PIPE WRENCH

A tool designed to grip and turn a pipe or rod about its axis in one direction only. piping

PILOT BALLOON

A small balloon whose ascent is followed by a theodolite in order to obtain data for the computation of the speed and direction of winds in the upper air.

PAWL

The driving link or holding link of a ratchet mechanism, permits motion in one direction only.

PANORAMIC RADAR

Nonscanning radar which transmits signals over a wide beam in the direction of interest.

ORIENTATION VECTOR

A vector whose direction indicates the orientation of a robot gripper.

ORIENTATION

Establishment of the correct relationship in direction with reference to the points of the compass.

ONE-SIDED ACCEPTANCE SAMPLING TEST

A test against a single specification only, in which permissible values in one direction are not limited.

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