1. To cut off the electron beam of a television picture tube, camera tube, or cathode-ray oscilloscope tube during the process of retrace by applying a rectangular pulse voltage to the grid or cathode during each retrace interval. Also known as beam blank. 2. The result of the final cutting operation on a natural crystal.
Related Terms |
FILTER ELEMENT
The porous device that performs the actual process of filtration. Also known as Cartridge
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HYDROFINISHING
A process for treating raw extracted base stocks with hydrogen to saturate them for improved stability.
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BEAM
The width of a ship. Also called breadth.
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BREADTH
The width of a ship.
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ACID ATTACK
Caused by an incomplete flushing after an acid cleaning process of boilers or similar equipment.
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ABSORPTION
The assimilation of one material into another; in petroleum refining, the use of an absorptive liquid to selectively remove components from a process stream.
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CRACKING
The process whereby large molecules are broken down by the application of heat and pressure to form smaller molecules.
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ADIABATIC PROCESS
A thermo-dynamic process in which no heat is extracted from or added to the system of the process.
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HALF-POWER POINTS
Power ratios used to define the angular width of a radar beam. One convention defines beam width as the angular width between points at which the field strength is 71 percent of its maximum value. Expressed in terms of power ratio, this convention defines beam width as the angular width between half-power points. A second convention defines beam width as the angular width between points at which the field strength is 50 percent of its maximum value. Expressed in terms of power ratio, the latter convention defines beam width as the angular width between quarter- power points.
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HALVING
The process of adjusting magnetic compass correctors so as to remove half of the deviation on the opposite cardinal or adjacent intercardinal headings to those on which adjustment was originally made when all deviation was removed. This is done to equalize the error on opposite headings.
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