BEARING LINE

A line extending in the direction of a bearing

Related Terms

PLI

A unit of line density (mass per unit length) equal to 1 pound per inch, or approximately 17.8580 kilograms per meter.

pli density line unit pound

PITCH ATTITUDE

The attitude of an aircraft, rocket, or other flying vehicle, referred to the relationship between the longitudinal body axis and a chosen reference line or plane as seen from the side.

pitch_attitude reference_line plane axis line longitudinal attitude

PIPELINE

A line of pipe connected to valves and other control devices, for conducting fluids, gases, or finely divided solids.

pipeline pipe line control

PIERHEAD LINE

The line in navigable waters beyond which construction is prohibited; open-pier construction may extend outward from the bulkhead line to the pierhead line.

pierhead_line line construction pierhead may bulkhead_line navigable beyond navigable_waters bulkhead

1. That portion, in facsimile, of the subject copy which is seen by the scanner at any instant; it can be considered a square area having dimensions equal to the width of the scanning line. 2. In television, any segment of a scanning line, the dimension of which along the line is exactly equal to the nominal line width; the area which is being explored at any instant in the scanning process. Also known as critical area; elemental area; pixel; recording spot; scanning spot.

picture_element dimension width dimensions line square can area scanner

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.

photoelectricloopcontrol regulator loop line control_system system may material control position

PENDULUM LEVEL

A leveling instrument in which the line of sight is automatically kept horizontal by a built-in pendulum device (such as a horizontal arm and a plumb line at right angles to the arm).

pendulum_level horizontal plumb_line sight line line_of_sight leveling right plumb instrument device leveling_instrument

PANCAKE AUGER

An auger having one spiral web, 12 to 15 inches (30 to 38 centimeters) in diameter, attached to the bottom end of a slender central shaft; used as removable deadman to which a drill rig or guy line is anchored.

pancake_auger bottom guy line drill end auger deadman rig

OFFSET LINE

A secondary line established close to and roughly parallel with the primary survey line to which it is referenced by measured offsets.

offset_line survey close parallel line secondary

OFF-LINE

1. A condition existing when the drive rod of the drill swivel head is not centered and parallel with the borehole being drilled. 2. A borehole that has deviated from its intended course. 3. A condition existing wherein any linear excavation (shaft, drift, borehole) deviates from a previously determined or intended survey line or course. 4. State in which an equipment or subsystem is in standby, maintenance, or mode of operation other than online.

off-line operation survey equipment parallel rod condition head line drill mode drive_rod drive linear excavation state