# TO PLOT

To draw lines and points to represent certain conditions graphically, as the various lines and points on a chart or plotting sheet rep- resenting the progress of a vessel, a curve of magnetic azimuths vs. time or of altitude vs. time, or a graphical solution of a problem, such as a relative motion solution.

## Related Terms

### COMPRESSOR

A device which converts mechanical force and motion into pneumatic flow power.

### JOURNAL BEARING

A sliding type of bearing having either rotating or oscillatory motion and in conjunction with which a journal operates. In a full or sleeve type journal bearing, the bearing surface is 360° in extent. In a partial bearing, the bearing surface is less than 360° in extent, i.e., 150°, 120°, etc.

### ARMATURE DEMAGNETIZATION

The reduction in the effective magnetic lines of force, produced by the armature current.

### ACCELERATION

The time rate of change of velocity; i.e., the derivative of velocity; with respect to time.

### RUNNING TIME

Amount of time an unit, equipment or system is run per hour or per 24 hours.

### GROUP REPETITION INTERVAL

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.

### AIR GAP

The space between magnetic poles, or between the rotating and stationary assemblies in a motor or generator.

### HARMONIC FUNCTION

Any real function that satisfies a certain equation. In its simplest form, as used in tide and tidal current predictions, it is a quantity that varies as the cosine of an angle that increases uniformly with time

### 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half of the deviation on the opposite cardinal or adjacent intercardinal headings to those on which adjustment was originally made when all deviation was removed.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.

### HEELING MAGNET

A permanent magnet placed vertically in a tube under the center of a marine magnetic compass, to correct for heeling error.

### Related questions

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