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The vertical pulse height of a signal, usually base to peak.

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The divergence of the air stream in a horizontal or vertical plane after it leaves the outlet.


A process for treating raw extracted base stocks with hydrogen to saturate them for improved stability.


An annular depression that may not be continuous, located at the base of many sea mounts, islands, and other isolated elevations of the sea floor, analogous to the moat around a castle.


The specified time interval of a Loran C chain for all stations of the chain to transmit their pulse groups. For each chain a minimum group repetition interval (GRI) is selected of sufficient duration to provide time for each station to transmit its pulse group and additional time between each pulse group so that signals from two or more stations cannot overlap in time anywhere within the coverage area. The GRI is normally stated in terms of tens of microseconds; i.e., the GRI having a duration of 79,900 microseconds is stated as 7900.


A fog that obscures less than six tenths of the sky, and does not extend to the base of any clouds


A radarscope phenomenon which appears as a constriction or expansion of the display near the center of the plan position indicator, which can be caused by a nonlinear time base or the sweep plot starting on the radar indicator at the same instant as the transmission of the pulse. The phenomenon is most apparent when in narrow rivers or close to shore.


The horizontal rotation of the spin axis of a gyroscope about the vertical axis


The oscillatory vertical rise and fall, due to the entire hull being lifted by the force of the sea. Also called HEAVING


A material which neutralizes acids. An oil additive containing colloidally dispersed metal carbonate, used to reduce corrosive wear.


The base fluid, usually a refined petroleum fraction or a selected synthetic material, into which additives are blended to produce finished lubricants.
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