A fluorescent screen designed for use with an x-ray tube to permit direct visual observation of x-ray shadow images of objects interposed between the x-ray tube and the screen.


Related Terms

PLUMMET

A loose-fitting metal plug in a tapered rotameter tube which moves upward (or downward) with an increase (or decrease) in fluid flow rate upward through the tube. Also known as float.

PITOT TUBE

An instrument that measures the stagnation pressure of a flowing fluid, consisting of an open tube pointing into the fluid and connected to a pressure-indicating device. Also known as impact tube.

PITOMETER LOG

A log consisting essentially of a pitot tube projecting into the water, and suitable registering devices.

PISTON CORER

A steel tube which is driven into the sediment by a free fall and by lead attached to the upper end, and which is capable of recovering undistorted vertical sections of sediment.

PIPE

A tube made of metal, clay, plastic, wood, or concrete and used to conduct a fluid, gas, or finely divided solid.

PHOTOEMISSIVE TUBE PHOTOMETER

A photometer which uses a tube made of a photoemissive material; it is highly accurate, but requires electronic amplification, and is used mainly in laboratories.

PACKED TUBE

A pipe or tube filled with high-heat-capacity granular material; used to heat gases when tubes are externally heated.

PACHUCA TANK

Air-agitated, solidliquid mixing vessel in which the air is injected into the bottom of a center draft tube; air and solids rise through the tube, with solids exiting the top of the tube and falling through the bulk of the liquid.

OUTPUT-METER ADAPTER

Device that can be slipped over the plate prong of the output tube 385 output-meter adapter output power of a radio receiver to provide a conventional terminal to which an output meter can be connected during alignment.

OUTGASSING

The release of adsorbed or occluded gases or water vapor, usually by heating, as from a vacuum tube or other vacuum system.

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