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Eng ID Term Definition
4901
sounding selection
1. Water depths numerically dis­played on a CHART. 2. The process of choosing individual water depths from a hydrographic survey in the co... more
1. Water depths numerically dis­played on a CHART. 2. The process of choosing individual water depths from a hydrographic survey in the compilation of a chart.
4902
sounding tube
A glass tube of small diameter, used with certain types of SOUNDING MACHINES in determining DEPTH.
4903
sounding wire
A wire used with a SOUNDING MACHINE in determining DEPTH.
4904
sound intensity
See INTENSITY.
4905
sound pressure
See PRESSURE.
4906
sound ray
A line perpendicular at each of its points to the fronts of a sound WAVE.
4907
sound signal
Any SOUND produced to convey intel­li­gence, as a FOG SIGNAL.
4908
sound signal: submarine
A SOUND SIGNAL transmitted through water.
4909
sound velocity
The rate of motion at which sound energy moves through a medium. The velocity of sound in SEA WATER is a function of temperature, SALINITY, ... more
The rate of motion at which sound energy moves through a medium. The velocity of sound in SEA WATER is a function of temperature, SALINITY, and the changes in pressure associated with changes in DEPTH. An increase in any of these factors tends to increase the VELOCITY.
4910
sound wave
See WAVE.
4911
source
The point where a RIVER rises.
4912
source diagram
A small scale map or index placed on a chart to indicate the coverage area, and textual description, of the source data, used in constructio... more
A small scale map or index placed on a chart to indicate the coverage area, and textual description, of the source data, used in construction of the chart. Also called compilation diagram.
4913
south celestial pole
See POLE: CELESTIAL.
4914
south geographical pole
See POLE: GEOGRAPHICAL.
4915
southing
The distance a craft makes good to the south. The opposite is NORTHING.
4916
south magnetic pole
See MAGNETIC POLE.
4917
space coordinates
See COORDINATES.
4918
space modulation
See MODULATION.
4919
spar buoy
A BUOY made of a tapered log or metal shaped like a tapered log, and secured so as to float in an approximately vertical position.
4920
sparker
An ECHO SOUNDER which uses an electrical spark discharge as the sound source. A RECORDER produ­ces a CHART which represents a vertical cros... more
An ECHO SOUNDER which uses an electrical spark discharge as the sound source. A RECORDER produ­ces a CHART which represents a vertical cross section of the geological structure beneath the water bottom.